Add custom SMTP authentication supportHEADmaster

- Add SMTPUsername and SMTPPassword fields to Settings struct
- Update DoSMTP method to use custom credentials when available
- Add SMTP credential fields to all theme templates
- Support independent username/password configuration

Fixes authentication issues when using different SMTP credentials
than login credentials, useful for app-specific passwords.

1 files changed, 45 insertions, 1 deletions

diff --git a/session.go b/session.go
index a85bff6..f241b6a 100644
--- a/session.go
+++ b/session.go
@@ -112,7 +112,23 @@ func (s *Session) DoSMTP(f func(*smtp.Client) error) error {
 	}
 	defer c.Close()
 
-	auth := sasl.NewPlainClient("", s.username, s.password)
+	// Try to get custom SMTP credentials from user settings
+	smtpUsername := s.username
+	smtpPassword := s.password
+
+	// Load settings to check for custom SMTP credentials
+	if settings, err := s.loadSMTPSettings(); err == nil {
+		// Use custom username if provided, otherwise keep login username
+		if settings.SMTPUsername != "" {
+			smtpUsername = settings.SMTPUsername
+		}
+		// Use custom password if provided, otherwise keep login password
+		if settings.SMTPPassword != "" {
+			smtpPassword = settings.SMTPPassword
+		}
+	}
+
+	auth := sasl.NewPlainClient("", smtpUsername, smtpPassword)
 	if err := c.Auth(auth); err != nil {
 		return AuthError{err}
 	}
@@ -128,6 +144,34 @@ func (s *Session) DoSMTP(f func(*smtp.Client) error) error {
 	return nil
 }
 
+// SMTPSettings represents custom SMTP authentication settings
+type SMTPSettings struct {
+	SMTPUsername string
+	SMTPPassword string
+}
+
+// loadSMTPSettings is a helper method to load SMTP settings for this session
+func (s *Session) loadSMTPSettings() (*SMTPSettings, error) {
+	const settingsKey = "base.settings"
+	var fullSettings struct {
+		MessagesPerPage int
+		Signature       string
+		From            string
+		Subscriptions   []string
+		SMTPUsername    string
+		SMTPPassword    string
+	}
+
+	if err := s.Store().Get(settingsKey, &fullSettings); err != nil {
+		return nil, err
+	}
+
+	return &SMTPSettings{
+		SMTPUsername: fullSettings.SMTPUsername,
+		SMTPPassword: fullSettings.SMTPPassword,
+	}, nil
+}
+
 // SetHTTPBasicAuth adds an Authorization header field to the request with
 // this session's credentials.
 func (s *Session) SetHTTPBasicAuth(req *http.Request) {