adjust base image

spamlist wildcards

See merge request etke.cc/postmoogle!35

.gitlab-ci.yml

@@ -4,13 +4,13 @@ stages:
 
 lint:
   stage: test
-  image: registry.gitlab.com/etke.cc/base
+  image: registry.gitlab.com/etke.cc/base/build
   script:
     - make lint
 
 unit:
   stage: test
-  image: registry.gitlab.com/etke.cc/base
+  image: registry.gitlab.com/etke.cc/base/build
   script:
     - make test
 

.golangci.yml

@@ -1,6 +1,6 @@
 run:
   concurrency: 4
-  timeout: 5m
+  timeout: 30m
   issues-exit-code: 1
   tests: true
   build-tags: []

Dockerfile

@@ -1,20 +1,16 @@
-FROM registry.gitlab.com/etke.cc/base AS builder
+FROM registry.gitlab.com/etke.cc/base/build AS builder
 
 WORKDIR /postmoogle
 COPY . .
 RUN make build
 
-FROM alpine:latest
+FROM registry.gitlab.com/etke.cc/base/app
 
 ENV POSTMOOGLE_DB_DSN /data/postmoogle.db
 
-RUN apk --no-cache add ca-certificates tzdata olm && \
-    adduser -D -g '' postmoogle && \
-    mkdir /data && chown -R postmoogle /data
-
 COPY --from=builder /postmoogle/postmoogle /bin/postmoogle
 
-USER postmoogle
+USER app
 
 ENTRYPOINT ["/bin/postmoogle"]
 

Makefile

@@ -50,4 +50,4 @@ login:
 # docker build
 docker:
 	docker buildx create --use
-	docker buildx build --platform linux/arm/v7,linux/arm64/v8,linux/amd64 --push -t ${CI_REGISTRY_IMAGE}:${CI_COMMIT_TAG} .
+	docker buildx build --platform linux/arm64/v8,linux/amd64 --push -t ${CI_REGISTRY_IMAGE}:${CI_COMMIT_TAG} .

README.md

@@ -17,6 +17,7 @@ so you can use it to send emails from your apps and scripts as well.
 - [x] Configuration in room's account data
 - [x] Receive emails to matrix rooms
 - [x] Receive attachments
+- [x] Catch-all mailbox
 - [x] Map email threads to matrix threads
 
 #### deep dive
@@ -32,7 +33,7 @@ so you can use it to send emails from your apps and scripts as well.
 
 - [x] SMTP client
 - [x] SMTP server (you can use Postmoogle as general purpose SMTP server to send emails from your scripts or apps)
-- [x] Send a message to matrix room with special format to send a new email
+- [x] Send a message to matrix room with special format to send a new email, even to multiple email addresses at once
 - [ ] Reply to matrix thread sends reply into email thread
 
 ## Configuration
@@ -54,7 +55,8 @@ env vars
 * **POSTMOOGLE_TLS_CERT** - path to your SSL certificate (chain)
 * **POSTMOOGLE_TLS_KEY** - path to your SSL certificate's private key
 * **POSTMOOGLE_TLS_REQUIRED** - require TLS connection, **even** on the non-TLS port (`POSTMOOGLE_PORT`). TLS connections are always required on the TLS port (`POSTMOOGLE_TLS_PORT`) regardless of this setting.
-* **POSTMOOGLE_NOENCRYPTION** - disable encryption support
+* **POSTMOOGLE_DATA_SECRET** - secure key (password) to encrypt account data, must be 16, 24, or 32 bytes long
+* **POSTMOOGLE_NOENCRYPTION** - disable matrix encryption (libolm) support
 * **POSTMOOGLE_STATUSMSG** - presence status message
 * **POSTMOOGLE_SENTRY_DSN** - sentry DSN
 * **POSTMOOGLE_LOGLEVEL** - log level
@@ -244,6 +246,7 @@ If you want to change them - check available options in the help message (`!pm h
 ---
 
 * **!pm nosender** - Get or set `nosender` of the room (`true` - hide email sender; `false` - show email sender)
+* **!pm norecipient** - Get or set `norecipient` of the room (`true` - hide recipient; `false` - show recipient)
 * **!pm nosubject** - Get or set `nosubject` of the room (`true` - hide email subject; `false` - show email subject)
 * **!pm nohtml** - Get or set `nohtml` of the room (`true` - ignore HTML in email; `false` - parse HTML in emails)
 * **!pm nothreads** - Get or set `nothreads` of the room (`true` - ignore email threads; `false` - convert email threads into matrix threads)
@@ -251,7 +254,14 @@ If you want to change them - check available options in the help message (`!pm h
 
 ---
 
+* **!pm spamcheck:mx** - only accept email from servers which seem prepared to receive it (those having valid MX records) (`true` - enable, `false` - disable)
+* **!pm spamcheck:smtp** - only accept email from servers which seem prepared to receive it (those listening on an SMTP port) (`true` - enable, `false` - disable)
+* **!pm spamlist** - Get or set `spamlist` of the room (comma-separated list), eg: `spammer@example.com,*@spammer.org,noreply@*`
+
+---
+
 * **!pm dkim** - Get DKIM signature
+* **!pm catch-all** - Configure catch-all mailbox
 * **!pm users** - Get or set allowed users patterns
 * **!pm mailboxes** - Show the list of all mailboxes
 * **!pm delete** <mailbox> - Delete specific mailbox

bot/access.go

@@ -5,6 +5,7 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/getsentry/sentry-go"
 	"github.com/raja/argon2pw"
 	"gitlab.com/etke.cc/go/mxidwc"
 	"maunium.net/go/mautrix/id"
@@ -40,7 +41,7 @@ func (b *Bot) allowOwner(actorID id.UserID, targetRoomID id.RoomID) bool {
 	}
 	cfg, err := b.getRoomSettings(targetRoomID)
 	if err != nil {
-		b.Error(context.Background(), targetRoomID, "failed to retrieve settings: %v", err)
+		b.Error(sentry.SetHubOnContext(context.Background(), sentry.CurrentHub()), targetRoomID, "failed to retrieve settings: %v", err)
 		return false
 	}
 
@@ -63,7 +64,7 @@ func (b *Bot) allowSend(actorID id.UserID, targetRoomID id.RoomID) bool {
 
 	cfg, err := b.getRoomSettings(targetRoomID)
 	if err != nil {
-		b.Error(context.Background(), targetRoomID, "failed to retrieve settings: %v", err)
+		b.Error(sentry.SetHubOnContext(context.Background(), sentry.CurrentHub()), targetRoomID, "failed to retrieve settings: %v", err)
 		return false
 	}
 

bot/bot.go

@@ -6,7 +6,6 @@ import (
 	"regexp"
 	"sync"
 
-	"git.sr.ht/~xn/cache/v2"
 	"github.com/getsentry/sentry-go"
 	"gitlab.com/etke.cc/go/logger"
 	"gitlab.com/etke.cc/linkpearl"
@@ -25,8 +24,6 @@ type Bot struct {
 	allowedAdmins           []*regexp.Regexp
 	commands                commandList
 	rooms                   sync.Map
-	botcfg                  cache.Cache[botSettings]
-	cfg                     cache.Cache[roomSettings]
 	mta                     utils.MTA
 	log                     *logger.Logger
 	lp                      *linkpearl.Linkpearl
@@ -46,8 +43,6 @@ func New(
 		prefix: prefix,
 		domain: domain,
 		rooms:  sync.Map{},
-		botcfg: cache.NewLRU[botSettings](1),
-		cfg:    cache.NewLRU[roomSettings](1000),
 		log:    log,
 		lp:     lp,
 		mu:     map[id.RoomID]*sync.Mutex{},
@@ -78,7 +73,9 @@ func (b *Bot) Error(ctx context.Context, roomID id.RoomID, message string, args
 	b.log.Error(message, args...)
 	err := fmt.Errorf(message, args...)
 
+	if hub := sentry.GetHubFromContext(ctx); hub != nil {
 		sentry.GetHubFromContext(ctx).CaptureException(err)
+	}
 	if roomID != "" {
 		b.SendError(ctx, roomID, err.Error())
 	}

bot/command.go

@@ -17,6 +17,7 @@ const (
 	commandStop      = "stop"
 	commandSend      = "send"
 	commandDKIM      = "dkim"
+	commandCatchAll  = botOptionCatchAll
 	commandUsers     = botOptionUsers
 	commandDelete    = "delete"
 	commandMailboxes = "mailboxes"
@@ -97,6 +98,15 @@ func (b *Bot) initCommands() commandList {
 			sanitizer: utils.SanitizeBoolString,
 			allowed:   b.allowOwner,
 		},
+		{
+			key: roomOptionNoRecipient,
+			description: fmt.Sprintf(
+				"Get or set `%s` of the room (`true` - hide recipient; `false` - show recipient)",
+				roomOptionNoRecipient,
+			),
+			sanitizer: utils.SanitizeBoolString,
+			allowed:   b.allowOwner,
+		},
 		{
 			key: roomOptionNoSubject,
 			description: fmt.Sprintf(
@@ -133,6 +143,28 @@ func (b *Bot) initCommands() commandList {
 			sanitizer: utils.SanitizeBoolString,
 			allowed:   b.allowOwner,
 		},
+		{allowed: b.allowOwner}, // delimiter
+		{
+			key:         roomOptionSpamcheckMX,
+			description: "only accept email from servers which seem prepared to receive it (those having valid MX records) (`true` - enable, `false` - disable)",
+			sanitizer:   utils.SanitizeBoolString,
+			allowed:     b.allowOwner,
+		},
+		{
+			key:         roomOptionSpamcheckSMTP,
+			description: "only accept email from servers which seem prepared to receive it (those listening on an SMTP port) (`true` - enable, `false` - disable)",
+			sanitizer:   utils.SanitizeBoolString,
+			allowed:     b.allowOwner,
+		},
+		{
+			key: roomOptionSpamlist,
+			description: fmt.Sprintf(
+				"Get or set `%s` of the room (comma-separated list), eg: `spammer@example.com,*@spammer.org,spam@*`",
+				roomOptionSpamlist,
+			),
+			sanitizer: utils.SanitizeStringSlice,
+			allowed:   b.allowOwner,
+		},
 		{allowed: b.allowAdmin}, // delimiter
 		{
 			key:         botOptionUsers,
@@ -144,6 +176,11 @@ func (b *Bot) initCommands() commandList {
 			description: "Get DKIM signature",
 			allowed:     b.allowAdmin,
 		},
+		{
+			key:         commandCatchAll,
+			description: "Get or set catch-all mailbox",
+			allowed:     b.allowAdmin,
+		},
 		{
 			key:         commandMailboxes,
 			description: "Show the list of all mailboxes",
@@ -184,6 +221,8 @@ func (b *Bot) handleCommand(ctx context.Context, evt *event.Event, commandSlice
 		b.runDKIM(ctx, commandSlice)
 	case commandUsers:
 		b.runUsers(ctx, commandSlice)
+	case commandCatchAll:
+		b.runCatchAll(ctx, commandSlice)
 	case commandDelete:
 		b.runDelete(ctx, commandSlice)
 	case commandMailboxes:
@@ -298,11 +337,6 @@ func (b *Bot) runSend(ctx context.Context) {
 		return
 	}
 
-	if !utils.AddressValid(to) {
-		b.Error(ctx, evt.RoomID, "email address is not valid")
-		return
-	}
-
 	cfg, err := b.getRoomSettings(evt.RoomID)
 	if err != nil {
 		b.Error(ctx, evt.RoomID, "failed to retrieve room settings: %v", err)
@@ -315,16 +349,29 @@ func (b *Bot) runSend(ctx context.Context) {
 		return
 	}
 
+	tos := strings.Split(to, ",")
+	// validate first
+	for _, to := range tos {
+		if !utils.AddressValid(to) {
+			b.Error(ctx, evt.RoomID, "email address is not valid")
+			return
+		}
+	}
+
 	from := mailbox + "@" + b.domain
 	ID := fmt.Sprintf("<%s@%s>", evt.ID, b.domain)
+	for _, to := range tos {
 		data := utils.
 			NewEmail(ID, "", subject, from, to, body, "", nil).
 			Compose(b.getBotSettings().DKIMPrivateKey())
 		err = b.mta.Send(from, to, data)
 		if err != nil {
-		b.Error(ctx, evt.RoomID, "cannot send email: %v", err)
-		return
+			b.Error(ctx, evt.RoomID, "cannot send email to %s: %v", to, err)
+		} else {
+			b.SendNotice(ctx, evt.RoomID, "Email has been sent to "+to)
+		}
+	}
+	if len(tos) > 1 {
+		b.SendNotice(ctx, evt.RoomID, "All emails were sent.")
 	}
-
-	b.SendNotice(ctx, evt.RoomID, "Email has been sent")
 }

bot/command_admin.go

@@ -166,3 +166,41 @@ func (b *Bot) runDKIM(ctx context.Context, commandSlice []string) {
 			"To reset the signature, send `%s dkim reset`",
 		signature, signature, b.prefix))
 }
+
+func (b *Bot) runCatchAll(ctx context.Context, commandSlice []string) {
+	evt := eventFromContext(ctx)
+	cfg := b.getBotSettings()
+	if len(commandSlice) < 2 {
+		var msg strings.Builder
+		msg.WriteString("Currently: `")
+		if cfg.CatchAll() != "" {
+			msg.WriteString(cfg.CatchAll())
+		} else {
+			msg.WriteString("not set")
+		}
+		msg.WriteString("`\n\n")
+		msg.WriteString("Usage: `")
+		msg.WriteString(b.prefix)
+		msg.WriteString(" catch-all MAILBOX`")
+		msg.WriteString("where mailbox is valid and existing mailbox name\n")
+
+		b.SendNotice(ctx, evt.RoomID, msg.String())
+		return
+	}
+
+	mailbox := utils.Mailbox(commandSlice[1])
+	_, ok := b.GetMapping(mailbox)
+	if !ok {
+		b.SendError(ctx, evt.RoomID, "mailbox does not exist, kupo.")
+		return
+	}
+
+	cfg.Set(botOptionCatchAll, mailbox)
+	err := b.setBotSettings(cfg)
+	if err != nil {
+		b.Error(ctx, evt.RoomID, "cannot save bot options: %v", err)
+		return
+	}
+
+	b.SendNotice(ctx, evt.RoomID, fmt.Sprintf("Catch-all is set to: `%s@%s`.", mailbox, b.domain))
+}

bot/command_owner.go

@@ -83,7 +83,7 @@ func (b *Bot) setOption(ctx context.Context, name, value string) {
 
 	evt := eventFromContext(ctx)
 	if name == roomOptionMailbox {
-		existingID, ok := b.GetMapping(value)
+		existingID, ok := b.getMapping(value)
 		if ok && existingID != "" && existingID != evt.RoomID {
 			b.SendNotice(ctx, evt.RoomID, fmt.Sprintf("Mailbox `%s@%s` already taken, kupo", value, b.domain))
 			return

bot/data.go

@@ -39,9 +39,9 @@ func (b *Bot) syncRooms() error {
 	for _, roomID := range resp.JoinedRooms {
 		cfg, serr := b.getRoomSettings(roomID)
 		if serr != nil {
-			b.log.Warn("cannot get %s settings: %v", roomID, err)
 			continue
 		}
+		b.migrateRoomSettings(roomID)
 		mailbox := cfg.Mailbox()
 		if mailbox != "" {
 			b.rooms.Store(mailbox, roomID)

bot/email.go

@@ -31,12 +31,12 @@ func (b *Bot) SetMTA(mta utils.MTA) {
 	b.mta = mta
 }
 
-// GetMapping returns mapping of mailbox = room
-func (b *Bot) GetMapping(mailbox string) (id.RoomID, bool) {
+func (b *Bot) getMapping(mailbox string) (id.RoomID, bool) {
 	v, ok := b.rooms.Load(mailbox)
 	if !ok {
 		return "", ok
 	}
+
 	roomID, ok := v.(id.RoomID)
 	if !ok {
 		return "", ok
@@ -45,6 +45,31 @@ func (b *Bot) GetMapping(mailbox string) (id.RoomID, bool) {
 	return roomID, ok
 }
 
+// GetMapping returns mapping of mailbox = room
+func (b *Bot) GetMapping(mailbox string) (id.RoomID, bool) {
+	roomID, ok := b.getMapping(mailbox)
+	if !ok {
+		catchAll := b.getBotSettings().CatchAll()
+		if catchAll == "" {
+			return roomID, ok
+		}
+		return b.getMapping(catchAll)
+	}
+
+	return roomID, ok
+}
+
+// GetIFOptions returns incoming email filtering options (room settings)
+func (b *Bot) GetIFOptions(roomID id.RoomID) utils.IncomingFilteringOptions {
+	cfg, err := b.getRoomSettings(roomID)
+	if err != nil {
+		b.log.Error("cannot retrieve room settings: %v", err)
+		return roomSettings{}
+	}
+
+	return cfg
+}
+
 // Send email to matrix room
 func (b *Bot) Send2Matrix(ctx context.Context, email *utils.Email, incoming bool) error {
 	roomID, ok := b.GetMapping(email.Mailbox(incoming))
@@ -174,19 +199,9 @@ func (b *Bot) Send2Email(ctx context.Context, to, subject, body string) error {
 func (b *Bot) sendFiles(ctx context.Context, roomID id.RoomID, files []*utils.File, noThreads bool, parentID id.EventID) {
 	for _, file := range files {
 		req := file.Convert()
-		resp, err := b.lp.GetClient().UploadMedia(req)
+		err := b.lp.SendFile(roomID, req, file.MsgType, utils.RelatesTo(!noThreads, parentID))
 		if err != nil {
 			b.Error(ctx, roomID, "cannot upload file %s: %v", req.FileName, err)
-			continue
-		}
-		_, err = b.lp.Send(roomID, &event.MessageEventContent{
-			MsgType:   file.MsgType,
-			Body:      req.FileName,
-			URL:       resp.ContentURI.CUString(),
-			RelatesTo: utils.RelatesTo(!noThreads, parentID),
-		})
-		if err != nil {
-			b.Error(ctx, roomID, "cannot send uploaded file %s: %v", req.FileName, err)
 		}
 	}
 }

bot/settings_bot.go

@@ -12,6 +12,7 @@ const acBotSettingsKey = "cc.etke.postmoogle.config"
 // bot options keys
 const (
 	botOptionUsers          = "users"
+	botOptionCatchAll       = "catch-all"
 	botOptionDKIMSignature  = "dkim.pub"
 	botOptionDKIMPrivateKey = "dkim.pem"
 )
@@ -42,6 +43,11 @@ func (s botSettings) Users() []string {
 	return []string{value}
 }
 
+// CatchAll option
+func (s botSettings) CatchAll() string {
+	return s.Get(botOptionCatchAll)
+}
+
 // DKIMSignature (DNS TXT record)
 func (s botSettings) DKIMSignature() string {
 	return s.Get(botOptionDKIMSignature)
@@ -68,29 +74,17 @@ func (b *Bot) initBotUsers() ([]string, error) {
 }
 
 func (b *Bot) getBotSettings() botSettings {
-	cfg := b.botcfg.Get(acBotSettingsKey)
-	if cfg != nil {
-		return cfg
-	}
-
-	config := botSettings{}
-	err := b.lp.GetClient().GetAccountData(acBotSettingsKey, &config)
+	config, err := b.lp.GetAccountData(acBotSettingsKey)
 	if err != nil {
-		if strings.Contains(err.Error(), "M_NOT_FOUND") {
-			err = nil
-		} else {
 		b.log.Error("cannot get bot settings: %v", utils.UnwrapError(err))
 	}
-	}
-
-	if err == nil {
-		b.botcfg.Set(acBotSettingsKey, config)
+	if config == nil {
+		config = map[string]string{}
 	}
 
 	return config
 }
 
 func (b *Bot) setBotSettings(cfg botSettings) error {
-	b.botcfg.Set(acBotSettingsKey, cfg)
-	return utils.UnwrapError(b.lp.GetClient().SetAccountData(acBotSettingsKey, cfg))
+	return utils.UnwrapError(b.lp.SetAccountData(acBotSettingsKey, cfg))
 }

bot/settings_room.go

@@ -17,11 +17,15 @@ const (
 	roomOptionMailbox       = "mailbox"
 	roomOptionNoSend        = "nosend"
 	roomOptionNoSender      = "nosender"
+	roomOptionNoRecipient   = "norecipient"
 	roomOptionNoSubject     = "nosubject"
 	roomOptionNoHTML        = "nohtml"
 	roomOptionNoThreads     = "nothreads"
 	roomOptionNoFiles       = "nofiles"
 	roomOptionPassword      = "password"
+	roomOptionSpamcheckSMTP = "spamcheck:smtp"
+	roomOptionSpamcheckMX   = "spamcheck:mx"
+	roomOptionSpamlist      = "spamlist"
 )
 
 type roomSettings map[string]string
@@ -56,6 +60,10 @@ func (s roomSettings) NoSender() bool {
 	return utils.Bool(s.Get(roomOptionNoSender))
 }
 
+func (s roomSettings) NoRecipient() bool {
+	return utils.Bool(s.Get(roomOptionNoRecipient))
+}
+
 func (s roomSettings) NoSubject() bool {
 	return utils.Bool(s.Get(roomOptionNoSubject))
 }
@@ -72,11 +80,69 @@ func (s roomSettings) NoFiles() bool {
 	return utils.Bool(s.Get(roomOptionNoFiles))
 }
 
+func (s roomSettings) SpamcheckSMTP() bool {
+	return utils.Bool(s.Get(roomOptionSpamcheckSMTP))
+}
+
+func (s roomSettings) SpamcheckMX() bool {
+	return utils.Bool(s.Get(roomOptionSpamcheckMX))
+}
+
+func (s roomSettings) Spamlist() []string {
+	return utils.StringSlice(s.Get(roomOptionSpamlist))
+}
+
+func (s roomSettings) migrateSpamlistSettings() {
+	uniq := map[string]struct{}{}
+	emails := utils.StringSlice(s.Get("spamlist:emails"))
+	localparts := utils.StringSlice(s.Get("spamlist:localparts"))
+	hosts := utils.StringSlice(s.Get("spamlist:hosts"))
+	list := utils.StringSlice(s.Get(roomOptionSpamlist))
+	delete(s, "spamlist:emails")
+	delete(s, "spamlist:localparts")
+	delete(s, "spamlist:hosts")
+
+	for _, email := range emails {
+		if email == "" {
+			continue
+		}
+		uniq[email] = struct{}{}
+	}
+
+	for _, localpart := range localparts {
+		if localpart == "" {
+			continue
+		}
+		uniq[localpart+"@*"] = struct{}{}
+	}
+
+	for _, host := range hosts {
+		if host == "" {
+			continue
+		}
+		uniq["*@"+host] = struct{}{}
+	}
+
+	for _, item := range list {
+		if item == "" {
+			continue
+		}
+		uniq[item] = struct{}{}
+	}
+
+	spamlist := make([]string, 0, len(uniq))
+	for item := range uniq {
+		spamlist = append(spamlist, item)
+	}
+	s.Set(roomOptionSpamlist, strings.Join(spamlist, ","))
+}
+
 // ContentOptions converts room display settings to content options
 func (s roomSettings) ContentOptions() *utils.ContentOptions {
 	return &utils.ContentOptions{
 		HTML:      !s.NoHTML(),
 		Sender:    !s.NoSender(),
+		Recipient: !s.NoRecipient(),
 		Subject:   !s.NoSubject(),
 		Threads:   !s.NoThreads(),
 
@@ -88,30 +154,31 @@ func (s roomSettings) ContentOptions() *utils.ContentOptions {
 }
 
 func (b *Bot) getRoomSettings(roomID id.RoomID) (roomSettings, error) {
-	cfg := b.cfg.Get(roomID.String())
-	if cfg != nil {
-		return cfg, nil
-	}
-
-	config := roomSettings{}
-	err := b.lp.GetClient().GetRoomAccountData(roomID, acRoomSettingsKey, &config)
-	if err != nil {
-		if strings.Contains(err.Error(), "M_NOT_FOUND") {
-			// Suppress `M_NOT_FOUND (HTTP 404): Room account data not found` errors.
-			// Until some settings are explicitly set, we don't store any.
-			// In such cases, just return a default (empty) settings object.
-			err = nil
-		}
-	}
-
-	if err == nil {
-		b.cfg.Set(roomID.String(), config)
+	config, err := b.lp.GetRoomAccountData(roomID, acRoomSettingsKey)
+	if config == nil {
+		config = map[string]string{}
 	}
 
 	return config, utils.UnwrapError(err)
 }
 
 func (b *Bot) setRoomSettings(roomID id.RoomID, cfg roomSettings) error {
-	b.cfg.Set(roomID.String(), cfg)
-	return utils.UnwrapError(b.lp.GetClient().SetRoomAccountData(roomID, acRoomSettingsKey, cfg))
+	return utils.UnwrapError(b.lp.SetRoomAccountData(roomID, acRoomSettingsKey, cfg))
+}
+
+func (b *Bot) migrateRoomSettings(roomID id.RoomID) {
+	cfg, err := b.getRoomSettings(roomID)
+	if err != nil {
+		b.log.Error("cannot retrieve room settings: %v", err)
+		return
+	}
+
+	if cfg["spamlist:emails"] == "" && cfg["spamlist:localparts"] == "" && cfg["spamlist:hosts"] == "" {
+		return
+	}
+	cfg.migrateSpamlistSettings()
+	err = b.setRoomSettings(roomID, cfg)
+	if err != nil {
+		b.log.Error("cannot migrate room settings: %v", err)
+	}
 }

cmd/cmd.go

@@ -76,6 +76,7 @@ func initBot(cfg *config.Config) {
 		DB:                db,
 		Dialect:           cfg.DB.Dialect,
 		NoEncryption:      cfg.NoEncryption,
+		AccountDataSecret: cfg.DataSecret,
 		LPLogger:          mxlog,
 		APILogger:         logger.New("api.", cfg.LogLevel),
 		StoreLogger:       logger.New("store.", cfg.LogLevel),

config/config.go

@@ -18,6 +18,7 @@ func New() *Config {
 		Domain:       env.String("domain", defaultConfig.Domain),
 		Port:         env.String("port", defaultConfig.Port),
 		NoEncryption: env.Bool("noencryption"),
+		DataSecret:   env.String("data.secret", defaultConfig.DataSecret),
 		MaxSize:      env.Int("maxsize", defaultConfig.MaxSize),
 		StatusMsg:    env.String("statusmsg", defaultConfig.StatusMsg),
 		Admins:       env.Slice("admins"),

config/types.go

@@ -14,6 +14,8 @@ type Config struct {
 	Port string
 	// RoomID of the admin room
 	LogLevel string
+	// DataSecret is account data secret key (password) to encrypt all account data values
+	DataSecret string
 	// NoEncryption disabled encryption support
 	NoEncryption bool
 	// Prefix for commands

go.mod

@@ -2,24 +2,27 @@ module gitlab.com/etke.cc/postmoogle
 
 go 1.18
 
+// replace gitlab.com/etke.cc/linkpearl => ../linkpearl
+
 require (
-	git.sr.ht/~xn/cache/v2 v2.0.0
 	github.com/emersion/go-msgauth v0.6.6
 	github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21
 	github.com/emersion/go-smtp v0.15.0
 	github.com/gabriel-vasile/mimetype v1.4.1
 	github.com/getsentry/sentry-go v0.13.0
 	github.com/jhillyerd/enmime v0.10.0
-	github.com/lib/pq v1.10.6
+	github.com/lib/pq v1.10.7
 	github.com/mattn/go-sqlite3 v1.14.15
 	github.com/raja/argon2pw v1.0.2-0.20210910183755-a391af63bd39
 	gitlab.com/etke.cc/go/env v1.0.0
 	gitlab.com/etke.cc/go/logger v1.1.0
 	gitlab.com/etke.cc/go/mxidwc v1.0.0
 	gitlab.com/etke.cc/go/secgen v1.1.1
-	gitlab.com/etke.cc/linkpearl v0.0.0-20220921080011-9407dc599571
-	golang.org/x/net v0.0.0-20220920203100-d0c6ba3f52d9
-	maunium.net/go/mautrix v0.12.1
+	gitlab.com/etke.cc/go/trysmtp v1.0.0
+	gitlab.com/etke.cc/go/validator v1.0.2
+	gitlab.com/etke.cc/linkpearl v0.0.0-20221012104738-a977907db8b9
+	golang.org/x/net v0.0.0-20221014081412-f15817d10f9b
+	maunium.net/go/mautrix v0.12.2
 )
 
 require (
@@ -28,6 +31,7 @@ require (
 	github.com/google/go-cmp v0.5.8 // indirect
 	github.com/gorilla/mux v1.8.0 // indirect
 	github.com/gorilla/websocket v1.5.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.4 // indirect
 	github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.16 // indirect
@@ -40,11 +44,11 @@ require (
 	github.com/ssor/bom v0.0.0-20170718123548-6386211fdfcf // indirect
 	github.com/tidwall/gjson v1.14.3 // indirect
 	github.com/tidwall/match v1.1.1 // indirect
-	github.com/tidwall/pretty v1.2.0 // indirect
+	github.com/tidwall/pretty v1.2.1 // indirect
 	github.com/tidwall/sjson v1.2.5 // indirect
-	github.com/yuin/goldmark v1.4.13 // indirect
-	golang.org/x/crypto v0.0.0-20220919173607-35f4265a4bc0 // indirect
-	golang.org/x/sys v0.0.0-20220919091848-fb04ddd9f9c8 // indirect
+	github.com/yuin/goldmark v1.5.2 // indirect
+	golang.org/x/crypto v0.0.0-20221012134737-56aed061732a // indirect
+	golang.org/x/sys v0.0.0-20221013171732-95e765b1cc43 // indirect
 	golang.org/x/text v0.3.7 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	maunium.net/go/maulogger/v2 v2.3.2 // indirect

go.sum

@@ -1,5 +1,3 @@
-git.sr.ht/~xn/cache/v2 v2.0.0 h1:aYzwGDyVIzjCl2yqcxZjprnu++Q3BmUQeK2agqvcQt8=
-git.sr.ht/~xn/cache/v2 v2.0.0/go.mod h1:HIPSMiDudQ483tRDup586e0YZdwMySIZFWXMPwYMuV8=
 github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
 github.com/cention-sany/utf7 v0.0.0-20170124080048-26cad61bd60a h1:MISbI8sU/PSK/ztvmWKFcI7UGb5/HQT7B+i3a2myKgI=
 github.com/cention-sany/utf7 v0.0.0-20170124080048-26cad61bd60a/go.mod h1:2GxOXOlEPAMFPfp014mK1SWq8G8BN8o7/dfYqJrVGn8=
@@ -34,12 +32,14 @@ github.com/gorilla/mux v1.8.0 h1:i40aqfkR1h2SlN9hojwV5ZA91wcXFOvkdNIeFDP5koI=
 github.com/gorilla/mux v1.8.0/go.mod h1:DVbg23sWSpFRCP0SfiEN6jmj59UnW/n46BH5rLB71So=
 github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc=
 github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
+github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
 github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7 h1:g0fAGBisHaEQ0TRq1iBvemFRf+8AEWEmBESSiWB3Vsc=
 github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7/go.mod h1:CVKlgaMiht+LXvHG173ujK6JUhZXKb2u/BQtjPDIvyk=
 github.com/jhillyerd/enmime v0.10.0 h1:DZEzhptPRBesvN3gf7K1BOh4rfpqdsdrEoxW1Edr/3s=
 github.com/jhillyerd/enmime v0.10.0/go.mod h1:Qpe8EEemJMFAF8+NZoWdpXvK2Yb9dRF0k/z6mkcDHsA=
-github.com/lib/pq v1.10.6 h1:jbk+ZieJ0D7EVGJYpL9QTz7/YW6UHbmdnZWYyK5cdBs=
-github.com/lib/pq v1.10.6/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
+github.com/lib/pq v1.10.7 h1:p7ZhMD+KsSRozJr34udlUrhboJwWAgCg34+/ZZNvZZw=
+github.com/lib/pq v1.10.7/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/martinlindhe/base36 v1.0.0/go.mod h1:+AtEs8xrBpCeYgSLoY/aJ6Wf37jtBuR0s35750M27+8=
 github.com/mattn/go-colorable v0.1.12/go.mod h1:u5H1YNBxpqRaxsYJYSkiCWKzEfiAb1Gb520KVy5xxl4=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
@@ -80,12 +80,13 @@ github.com/tidwall/gjson v1.14.3 h1:9jvXn7olKEHU1S9vwoMGliaT8jq1vJ7IH/n9zD9Dnlw=
 github.com/tidwall/gjson v1.14.3/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
 github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
 github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
-github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
 github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
+github.com/tidwall/pretty v1.2.1 h1:qjsOFOWWQl+N3RsoF5/ssm1pHmJJwhjlSbZ51I6wMl4=
+github.com/tidwall/pretty v1.2.1/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
 github.com/tidwall/sjson v1.2.5 h1:kLy8mja+1c9jlljvWTlSazM7cKDRfJuR/bOJhcY5NcY=
 github.com/tidwall/sjson v1.2.5/go.mod h1:Fvgq9kS/6ociJEDnK0Fk1cpYF4FIW6ZF7LAe+6jwd28=
-github.com/yuin/goldmark v1.4.13 h1:fVcFKWvrslecOb/tg+Cc05dkeYx540o0FuFt3nUVDoE=
-github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
+github.com/yuin/goldmark v1.5.2 h1:ALmeCk/px5FSm1MAcFBAsVKZjDuMVj8Tm7FFIlMJnqU=
+github.com/yuin/goldmark v1.5.2/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 gitlab.com/etke.cc/go/env v1.0.0 h1:J98BwzOuELnjsVPFvz5wa79L7IoRV9CmrS41xLYXtSw=
 gitlab.com/etke.cc/go/env v1.0.0/go.mod h1:e1l4RM5MA1sc0R1w/RBDAESWRwgo5cOG9gx8BKUn2C4=
 gitlab.com/etke.cc/go/logger v1.1.0 h1:Yngp/DDLmJ0jJNLvLXrfan5Gi5QV+r7z6kCczTv8t4U=
@@ -94,16 +95,20 @@ gitlab.com/etke.cc/go/mxidwc v1.0.0 h1:6EAlJXvs3nU4RaMegYq6iFlyVvLw7JZYnZmNCGMYQ
 gitlab.com/etke.cc/go/mxidwc v1.0.0/go.mod h1:E/0kh45SAN9+ntTG0cwkAEKdaPxzvxVmnjwivm9nmz8=
 gitlab.com/etke.cc/go/secgen v1.1.1 h1:RmKOki725HIhWJHzPtAc9X4YvBneczndchpMgoDkE8w=
 gitlab.com/etke.cc/go/secgen v1.1.1/go.mod h1:3pJqRGeWApzx7qXjABqz2o2SMCNpKSZao/gXVdasqE8=
-gitlab.com/etke.cc/linkpearl v0.0.0-20220921080011-9407dc599571 h1:ool1wnAnnIhZjwPMd0LUebpfxqXZcVhRli2UDhay0bA=
-gitlab.com/etke.cc/linkpearl v0.0.0-20220921080011-9407dc599571/go.mod h1:4qbyfbuJSj89jFW7F+YjIbYrwJTrALQf4Otw0KGkIWE=
+gitlab.com/etke.cc/go/trysmtp v1.0.0 h1:f/7gSmzohKniVeLSLevI+ZsySYcPUGkT9cRlOTwjOr8=
+gitlab.com/etke.cc/go/trysmtp v1.0.0/go.mod h1:KqRuIB2IPElEEbAxXmFyKtm7S5YiuEb4lxwWthccqyE=
+gitlab.com/etke.cc/go/validator v1.0.2 h1:7iVHG9sh1Hz6YcNT+tTLDm60B2PVSz6eh9nh6KOx7LI=
+gitlab.com/etke.cc/go/validator v1.0.2/go.mod h1:3vdssRG4LwgdTr9IHz9MjGSEO+3/FO9hXPGMuSeweJ8=
+gitlab.com/etke.cc/linkpearl v0.0.0-20221012104738-a977907db8b9 h1:CJyYRf4KGmaFJDBJS5NXkt9v5ICi/AHrJIIOinQD/os=
+gitlab.com/etke.cc/linkpearl v0.0.0-20221012104738-a977907db8b9/go.mod h1:HkUHUkhbkDueEJVc7h/zBfz2hjhl4xxjQKv9Itrdf9k=
 golang.org/x/crypto v0.0.0-20220518034528-6f7dac969898/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/crypto v0.0.0-20220919173607-35f4265a4bc0 h1:a5Yg6ylndHHYJqIPrdq0AhvR6KTvDTAvgBtaidhEevY=
-golang.org/x/crypto v0.0.0-20220919173607-35f4265a4bc0/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
+golang.org/x/crypto v0.0.0-20221012134737-56aed061732a h1:NmSIgad6KjE6VvHciPZuNRTKxGhlPfD6OA87W/PLkqg=
+golang.org/x/crypto v0.0.0-20221012134737-56aed061732a/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/net v0.0.0-20210501142056-aec3718b3fa0/go.mod h1:OJAsFXCWl8Ukc7SiCT/9KSuxbyM7479/AVlXFRxuMCk=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
-golang.org/x/net v0.0.0-20220920203100-d0c6ba3f52d9 h1:asZqf0wXastQr+DudYagQS8uBO8bHKeYD1vbAvGmFL8=
-golang.org/x/net v0.0.0-20220920203100-d0c6ba3f52d9/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
+golang.org/x/net v0.0.0-20221014081412-f15817d10f9b h1:tvrvnPFcdzp294diPnrdZZZ8XUt2Tyj7svb7X52iDuU=
+golang.org/x/net v0.0.0-20221014081412-f15817d10f9b/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -111,8 +116,8 @@ golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220919091848-fb04ddd9f9c8 h1:h+EGohizhe9XlX18rfpa8k8RAc5XyaeamM+0VHRd4lc=
-golang.org/x/sys v0.0.0-20220919091848-fb04ddd9f9c8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20221013171732-95e765b1cc43 h1:OK7RB6t2WQX54srQQYSXMW8dF5C6/8+oA/s5QBmmto4=
+golang.org/x/sys v0.0.0-20221013171732-95e765b1cc43/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
@@ -128,5 +133,5 @@ gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 maunium.net/go/maulogger/v2 v2.3.2 h1:1XmIYmMd3PoQfp9J+PaHhpt80zpfmMqaShzUTC7FwY0=
 maunium.net/go/maulogger/v2 v2.3.2/go.mod h1:TYWy7wKwz/tIXTpsx8G3mZseIRiC5DoMxSZazOHy68A=
-maunium.net/go/mautrix v0.12.1 h1:MLfkWkpRIgUn7lueDSlPwYOeIuGF+NrAHW0hInIuVAw=
-maunium.net/go/mautrix v0.12.1/go.mod h1:/jxQFIipObSsjZPH6o3xyUi8uoULz3Hfr/8p9loqpYE=
+maunium.net/go/mautrix v0.12.2 h1:HuIDgigR6VY2QUPyZADCwn8UZWYAqi31a77qd1jMPA4=
+maunium.net/go/mautrix v0.12.2/go.mod h1:bCw45Qx/m9qsz7eazmbe7Rzq5ZbTPzwRE1UgX2S9DXs=

smtp/msasession.go

@@ -9,6 +9,7 @@ import (
 	"github.com/getsentry/sentry-go"
 	"github.com/jhillyerd/enmime"
 	"gitlab.com/etke.cc/go/logger"
+	"gitlab.com/etke.cc/go/validator"
 
 	"gitlab.com/etke.cc/postmoogle/utils"
 )
@@ -43,6 +44,7 @@ func (s *msasession) Mail(from string, opts smtp.MailOptions) error {
 
 func (s *msasession) Rcpt(to string) error {
 	sentry.GetHubFromContext(s.ctx).Scope().SetTag("to", to)
+	s.to = to
 
 	if s.incoming {
 		if utils.Hostname(to) != s.domain {
@@ -50,14 +52,18 @@ func (s *msasession) Rcpt(to string) error {
 			return smtp.ErrAuthRequired
 		}
 
-		_, ok := s.bot.GetMapping(utils.Mailbox(to))
+		roomID, ok := s.bot.GetMapping(utils.Mailbox(to))
 		if !ok {
 			s.log.Debug("mapping for %s not found", to)
 			return smtp.ErrAuthRequired
 		}
+
+		validations := s.bot.GetIFOptions(roomID)
+		if !s.validate(validations) {
+			return smtp.ErrAuthRequired
+		}
 	}
 
-	s.to = to
 	s.log.Debug("mail to %s", to)
 	return nil
 }
@@ -75,6 +81,17 @@ func (s *msasession) parseAttachments(parts []*enmime.Part) []*utils.File {
 	return files
 }
 
+func (s *msasession) validate(options utils.IncomingFilteringOptions) bool {
+	enforce := validator.Enforce{
+		Email: true,
+		MX:    options.SpamcheckMX(),
+		SMTP:  options.SpamcheckMX(),
+	}
+	v := validator.New(options.Spamlist(), enforce, s.to, s.log)
+
+	return v.Email(s.from)
+}
+
 func (s *msasession) Data(r io.Reader) error {
 	parser := enmime.NewParser()
 	eml, err := parser.ReadEnvelope(r)

smtp/mta.go

@@ -2,14 +2,11 @@ package smtp
 
 import (
 	"context"
-	"crypto/tls"
-	"fmt"
 	"io"
-	"net"
-	"net/smtp"
 	"strings"
 
 	"gitlab.com/etke.cc/go/logger"
+	"gitlab.com/etke.cc/go/trysmtp"
 	"maunium.net/go/mautrix/id"
 
 	"gitlab.com/etke.cc/postmoogle/utils"
@@ -19,6 +16,7 @@ import (
 type Bot interface {
 	AllowAuth(string, string) bool
 	GetMapping(string) (id.RoomID, bool)
+	GetIFOptions(id.RoomID) utils.IncomingFilteringOptions
 	Send2Matrix(ctx context.Context, email *utils.Email, incoming bool) error
 	SetMTA(mta utils.MTA)
 }
@@ -28,9 +26,6 @@ type mta struct {
 	log *logger.Logger
 }
 
-// SMTPAddrs priority list
-var SMTPAddrs = []string{":25", ":587", ":465"}
-
 func NewMTA(loglevel string) utils.MTA {
 	return &mta{
 		log: logger.New("smtp/mta.", loglevel),
@@ -39,22 +34,12 @@ func NewMTA(loglevel string) utils.MTA {
 
 func (m *mta) Send(from, to, data string) error {
 	m.log.Debug("Sending email from %s to %s", from, to)
-	conn, err := m.connect(from, to)
+	conn, err := trysmtp.Connect(from, to)
 	if err != nil {
 		m.log.Error("cannot connect to SMTP server of %s: %v", to, err)
 		return err
 	}
 	defer conn.Close()
-	err = conn.Mail(from)
-	if err != nil {
-		m.log.Error("cannot call MAIL command: %v", err)
-		return err
-	}
-	err = conn.Rcpt(to)
-	if err != nil {
-		m.log.Error("cannot send RCPT command: %v", err)
-		return err
-	}
 
 	var w io.WriteCloser
 	w, err = conn.Data()
@@ -73,61 +58,3 @@ func (m *mta) Send(from, to, data string) error {
 	m.log.Debug("email has been sent")
 	return nil
 }
-
-func (m *mta) tryServer(localname, mxhost, addr string) *smtp.Client {
-	m.log.Debug("trying SMTP connection to %s%s", mxhost, addr)
-	conn, err := smtp.Dial(mxhost + addr)
-	if err != nil {
-		m.log.Warn("cannot connect to the %s%s: %v", mxhost, addr, err)
-		return nil
-	}
-	err = conn.Hello(localname)
-	if err != nil {
-		m.log.Warn("cannot call HELLO command of the %s%s: %v", mxhost, addr, err)
-		return nil
-	}
-	if ok, _ := conn.Extension("STARTTLS"); ok {
-		m.log.Debug("%s supports STARTTLS", mxhost)
-		config := &tls.Config{ServerName: mxhost}
-		err = conn.StartTLS(config)
-		if err != nil {
-			m.log.Warn("STARTTLS connection to the %s failed: %v", mxhost, err)
-		}
-	}
-
-	return conn
-}
-
-func (m *mta) connect(from, to string) (*smtp.Client, error) {
-	localname := strings.SplitN(from, "@", 2)[1]
-	hostname := strings.SplitN(to, "@", 2)[1]
-
-	m.log.Debug("performing MX lookup of %s", hostname)
-	mxs, err := net.LookupMX(hostname)
-	if err != nil {
-		m.log.Error("cannot perform MX lookup: %v", err)
-		return nil, err
-	}
-
-	for _, mx := range mxs {
-		for _, addr := range SMTPAddrs {
-			client := m.tryServer(localname, strings.TrimSuffix(mx.Host, "."), addr)
-			if client != nil {
-				return client, nil
-			}
-		}
-	}
-
-	// If there are no MX records, according to https://datatracker.ietf.org/doc/html/rfc5321#section-5.1,
-	// we're supposed to try talking directly to the host.
-	if len(mxs) == 0 {
-		for _, addr := range SMTPAddrs {
-			client := m.tryServer(localname, hostname, addr)
-			if client != nil {
-				return client, nil
-			}
-		}
-	}
-
-	return nil, fmt.Errorf("target SMTP server not found")
-}

utils/command.go

@@ -10,12 +10,12 @@ var ErrInvalidArgs = fmt.Errorf("invalid arguments")
 
 // ParseSend parses "!pm send" command, returns to, subject, body, err
 func ParseSend(commandSlice []string) (string, string, string, error) {
-	if len(commandSlice) < 3 {
+	message := strings.Join(commandSlice, " ")
+	lines := strings.Split(message, "\n")
+	if len(lines) < 3 {
 		return "", "", "", ErrInvalidArgs
 	}
 
-	message := strings.Join(commandSlice, " ")
-	lines := strings.Split(message, "\n")
 	commandSlice = strings.Split(lines[0], " ")
 	to := commandSlice[1]
 	subject := lines[1]

utils/email.go

@@ -19,6 +19,13 @@ type MTA interface {
 	Send(from, to, data string) error
 }
 
+// IncomingFilteringOptions for incoming mail
+type IncomingFilteringOptions interface {
+	SpamcheckSMTP() bool
+	SpamcheckMX() bool
+	Spamlist() []string
+}
+
 // Email object
 type Email struct {
 	Date      string
@@ -36,6 +43,7 @@ type Email struct {
 type ContentOptions struct {
 	// On/Off
 	Sender    bool
+	Recipient bool
 	Subject   bool
 	HTML      bool
 	Threads   bool
@@ -92,7 +100,12 @@ func (e *Email) Content(threadID id.EventID, options *ContentOptions) *event.Con
 	if options.Sender {
 		text.WriteString("From: ")
 		text.WriteString(e.From)
-		text.WriteString("\n\n")
+		text.WriteString("\n")
+	}
+	if options.Recipient {
+		text.WriteString("To: ")
+		text.WriteString(e.To)
+		text.WriteString("\n")
 	}
 	if options.Subject {
 		text.WriteString("# ")
@@ -129,6 +142,9 @@ func (e *Email) Compose(privkey string) string {
 	data.WriteString("Content-Type: text/plain; charset=\"UTF-8\"")
 	data.WriteString("\r\n")
 
+	data.WriteString("Content-Transfer-Encoding: 8BIT")
+	data.WriteString("\r\n")
+
 	data.WriteString("From: ")
 	data.WriteString(e.From)
 	data.WriteString("\r\n")

utils/file.go

@@ -31,8 +31,8 @@ func NewFile(name string, content []byte) *File {
 	return file
 }
 
-func (f *File) Convert() mautrix.ReqUploadMedia {
-	return mautrix.ReqUploadMedia{
+func (f *File) Convert() *mautrix.ReqUploadMedia {
+	return &mautrix.ReqUploadMedia{
 		ContentBytes:  f.Content,
 		Content:       bytes.NewReader(f.Content),
 		ContentLength: int64(f.Length),

utils/utils.go

@@ -33,3 +33,31 @@ func Bool(str string) bool {
 func SanitizeBoolString(str string) string {
 	return strconv.FormatBool(Bool(str))
 }
+
+// StringSlice converts comma-separated string to slice
+func StringSlice(str string) []string {
+	if str == "" {
+		return nil
+	}
+
+	str = strings.TrimSpace(str)
+	if strings.IndexByte(str, ',') == -1 {
+		return []string{str}
+	}
+
+	return strings.Split(str, ",")
+}
+
+// SanitizeBoolString converts string to slice and back to string
+func SanitizeStringSlice(str string) string {
+	parts := StringSlice(str)
+	if len(parts) == 0 {
+		return str
+	}
+
+	for i, part := range parts {
+		parts[i] = strings.TrimSpace(part)
+	}
+
+	return strings.Join(parts, ",")
+}