Shared secret auth support, contributed by @JeWe37

config/config.go

@@ -16,6 +16,7 @@ func New() *Config {
 		Homeserver:   env.String("homeserver", defaultConfig.Homeserver),
 		Login:        env.String("login", defaultConfig.Login),
 		Password:     env.String("password", defaultConfig.Password),
+		SharedSecret: env.String("sharedsecret", defaultConfig.SharedSecret),
 		Prefix:       env.String("prefix", defaultConfig.Prefix),
 		Domains:      migrateDomains("domain", "domains"),
 		Port:         env.String("port", defaultConfig.Port),

config/types.go

@@ -6,10 +6,12 @@ import "time"
 type Config struct {
 	// Homeserver url
 	Homeserver string
-	// Login is a MXID localpart (scheduler - OK, @scheduler:example.com - wrong)
+	// Login is a localpart if logging in with password (postmoogle) OR full MXID if logging in with shared secret (@postmoogle:example.com)
 	Login string
 	// Password for login/password auth only
 	Password string
+	// SharedSecret for login/sharedsecret auth only
+	SharedSecret string
 	// Domains for SMTP
 	Domains []string
 	// Port for SMTP