diff --git a/bot/command.go b/bot/command.go
index fc92b5b..df202d4 100644
--- a/bot/command.go
+++ b/bot/command.go
@@ -143,6 +143,46 @@ func (b *Bot) initCommands() commandList {
 			sanitizer: utils.SanitizeBoolString,
 			allowed:   b.allowOwner,
 		},
+		{allowed: b.allowOwner}, // delimiter
+		{
+			key:         roomOptionSecurityEmail,
+			description: "Enforce sender email address validation (`true` - enforce, `false` - disable)",
+			sanitizer:   utils.SanitizeBoolString,
+			allowed:     b.allowOwner,
+		},
+		{
+			key:         roomOptionSecuritySMTP,
+			description: "Enforce sender email SMTP check (`true` - enforce, `false` - disable)",
+			sanitizer:   utils.SanitizeBoolString,
+			allowed:     b.allowOwner,
+		},
+		{
+			key: roomOptionSpamEmails,
+			description: fmt.Sprintf(
+				"Get or set `%s` of the room (comma-separated list)",
+				roomOptionSpamEmails,
+			),
+			sanitizer: utils.SanitizeStringSlice,
+			allowed:   b.allowOwner,
+		},
+		{
+			key: roomOptionSpamHosts,
+			description: fmt.Sprintf(
+				"Get or set `%s` of the room (comma-separated list)",
+				roomOptionSpamHosts,
+			),
+			sanitizer: utils.SanitizeStringSlice,
+			allowed:   b.allowOwner,
+		},
+		{
+			key: roomOptionSpamLocalparts,
+			description: fmt.Sprintf(
+				"Get or set `%s` of the room (comma-separated list)",
+				roomOptionSpamLocalparts,
+			),
+			sanitizer: utils.SanitizeStringSlice,
+			allowed:   b.allowOwner,
+		},
 		{allowed: b.allowAdmin}, // delimiter
 		{
 			key:         botOptionUsers,
diff --git a/bot/settings_room.go b/bot/settings_room.go
index 7870aa7..57d57b9 100644
--- a/bot/settings_room.go
+++ b/bot/settings_room.go
@@ -13,16 +13,21 @@ const acRoomSettingsKey = "cc.etke.postmoogle.settings"
 
 // option keys
 const (
-	roomOptionOwner       = "owner"
-	roomOptionMailbox     = "mailbox"
-	roomOptionNoSend      = "nosend"
-	roomOptionNoSender    = "nosender"
-	roomOptionNoRecipient = "norecipient"
-	roomOptionNoSubject   = "nosubject"
-	roomOptionNoHTML      = "nohtml"
-	roomOptionNoThreads   = "nothreads"
-	roomOptionNoFiles     = "nofiles"
-	roomOptionPassword    = "password"
+	roomOptionOwner          = "owner"
+	roomOptionMailbox        = "mailbox"
+	roomOptionNoSend         = "nosend"
+	roomOptionNoSender       = "nosender"
+	roomOptionNoRecipient    = "norecipient"
+	roomOptionNoSubject      = "nosubject"
+	roomOptionNoHTML         = "nohtml"
+	roomOptionNoThreads      = "nothreads"
+	roomOptionNoFiles        = "nofiles"
+	roomOptionPassword       = "password"
+	roomOptionSecuritySMTP   = "security:smtp"
+	roomOptionSecurityEmail  = "security:email"
+	roomOptionSpamEmails     = "spam:emails"
+	roomOptionSpamHosts      = "spam:hosts"
+	roomOptionSpamLocalparts = "spam:localparts"
 )
 
 type roomSettings map[string]string
@@ -77,6 +82,26 @@ func (s roomSettings) NoFiles() bool {
 	return utils.Bool(s.Get(roomOptionNoFiles))
 }
 
+func (s roomSettings) SecuritySMTP() bool {
+	return utils.Bool(s.Get(roomOptionSecuritySMTP))
+}
+
+func (s roomSettings) SecurityEmail() bool {
+	return utils.Bool(s.Get(roomOptionSecurityEmail))
+}
+
+func (s roomSettings) SpamEmails() []string {
+	return utils.StringSlice(s.Get(roomOptionSpamEmails))
+}
+
+func (s roomSettings) SpamHosts() []string {
+	return utils.StringSlice(s.Get(roomOptionSpamHosts))
+}
+
+func (s roomSettings) SpamLocalparts() []string {
+	return utils.StringSlice(s.Get(roomOptionSpamLocalparts))
+}
+
 // ContentOptions converts room display settings to content options
 func (s roomSettings) ContentOptions() *utils.ContentOptions {
 	return &utils.ContentOptions{
diff --git a/utils/utils.go b/utils/utils.go
index 93271da..f49939a 100644
--- a/utils/utils.go
+++ b/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, ",")
+}