FEATURE (email): Allow SMTP without auth

backend/internal/features/notifiers/models/email_notifier/model.go

@@ -25,8 +25,8 @@ type EmailNotifier struct {
 	TargetEmail  string    `json:"targetEmail"  gorm:"not null;type:varchar(255);column:target_email"`
 	SMTPHost     string    `json:"smtpHost"     gorm:"not null;type:varchar(255);column:smtp_host"`
 	SMTPPort     int       `json:"smtpPort"     gorm:"not null;column:smtp_port"`
-	SMTPUser     string    `json:"smtpUser"     gorm:"not null;type:varchar(255);column:smtp_user"`
-	SMTPPassword string    `json:"smtpPassword" gorm:"not null;type:varchar(255);column:smtp_password"`
+	SMTPUser     string    `json:"smtpUser"     gorm:"type:varchar(255);column:smtp_user"`
+	SMTPPassword string    `json:"smtpPassword" gorm:"type:varchar(255);column:smtp_password"`
 }
 
 func (e *EmailNotifier) TableName() string {
@@ -46,12 +46,9 @@ func (e *EmailNotifier) Validate() error {
 		return errors.New("SMTP port is required")
 	}
 
-	if e.SMTPUser == "" {
-		return errors.New("SMTP user is required")
-	}
-
-	if e.SMTPPassword == "" {
-		return errors.New("SMTP password is required")
+	// Authentication is optional - both user and password must be provided together or both empty
+	if (e.SMTPUser == "") != (e.SMTPPassword == "") {
+		return errors.New("SMTP user and password must both be provided or both be empty")
 	}
 
 	return nil
@@ -60,6 +57,10 @@ func (e *EmailNotifier) Validate() error {
 func (e *EmailNotifier) Send(logger *slog.Logger, heading string, message string) error {
 	// Compose email
 	from := e.SMTPUser
+	if from == "" {
+		from = "noreply@" + e.SMTPHost
+	}
+
 	to := []string{e.TargetEmail}
 
 	// Format the email content
@@ -78,6 +79,9 @@ func (e *EmailNotifier) Send(logger *slog.Logger, heading string, message string
 	addr := net.JoinHostPort(e.SMTPHost, fmt.Sprintf("%d", e.SMTPPort))
 	timeout := DefaultTimeout
 
+	// Determine if authentication is required
+	authRequired := e.SMTPUser != "" && e.SMTPPassword != ""
+
 	// Handle different port scenarios
 	if e.SMTPPort == ImplicitTLSPort {
 		// Implicit TLS (port 465)
@@ -105,10 +109,12 @@ func (e *EmailNotifier) Send(logger *slog.Logger, heading string, message string
 			_ = client.Quit()
 		}()
 
-		// Set up authentication
-		auth := smtp.PlainAuth("", e.SMTPUser, e.SMTPPassword, e.SMTPHost)
-		if err := client.Auth(auth); err != nil {
-			return fmt.Errorf("SMTP authentication failed: %w", err)
+		// Set up authentication only if credentials are provided
+		if authRequired {
+			auth := smtp.PlainAuth("", e.SMTPUser, e.SMTPPassword, e.SMTPHost)
+			if err := client.Auth(auth); err != nil {
+				return fmt.Errorf("SMTP authentication failed: %w", err)
+			}
 		}
 
 		// Set sender and recipients
@@ -138,9 +144,6 @@ func (e *EmailNotifier) Send(logger *slog.Logger, heading string, message string
 		return nil
 	} else {
 		// STARTTLS (port 587) or other ports
-		// Set up authentication information
-		auth := smtp.PlainAuth("", e.SMTPUser, e.SMTPPassword, e.SMTPHost)
-
 		// Create a custom dialer with timeout
 		dialer := &net.Dialer{Timeout: timeout}
 		conn, err := dialer.Dial("tcp", addr)
@@ -169,8 +172,12 @@ func (e *EmailNotifier) Send(logger *slog.Logger, heading string, message string
 			}
 		}
 
-		if err := client.Auth(auth); err != nil {
-			return fmt.Errorf("SMTP authentication failed: %w", err)
+		// Authenticate only if credentials are provided
+		if authRequired {
+			auth := smtp.PlainAuth("", e.SMTPUser, e.SMTPPassword, e.SMTPHost)
+			if err := client.Auth(auth); err != nil {
+				return fmt.Errorf("SMTP authentication failed: %w", err)
+			}
 		}
 
 		if err := client.Mail(from); err != nil {

backend/migrations/20250715102801_allow_unauthorized_smtp.sql

@@ -0,0 +1,17 @@
+-- +goose Up
+-- +goose StatementBegin
+
+ALTER TABLE email_notifiers
+    ALTER COLUMN smtp_user DROP NOT NULL,
+    ALTER COLUMN smtp_password DROP NOT NULL;
+
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+
+ALTER TABLE email_notifiers
+    ALTER COLUMN smtp_user SET NOT NULL,
+    ALTER COLUMN smtp_password SET NOT NULL;
+
+-- +goose StatementEnd

frontend/src/entity/notifiers/models/email/validateEmailNotifier.ts

@@ -13,13 +13,5 @@ export const validateEmailNotifier = (notifier: EmailNotifier): boolean => {
     return false;
   }
 
-  if (!notifier.smtpUser) {
-    return false;
-  }
-
-  if (!notifier.smtpPassword) {
-    return false;
-  }
-
   return true;
 };

frontend/src/features/notifiers/ui/edit/EditNotifierComponent.tsx

@@ -72,9 +72,12 @@ export function EditNotifierComponent({
       });
     } catch (e) {
       alert((e as Error).message);
-      alert(
-        'Make sure channel is public or bot is added to the private channel (via @invite) or group. For direct messages use User ID from Slack profile.',
-      );
+
+      if (notifier.notifierType === NotifierType.SLACK) {
+        alert(
+          'Make sure channel is public or bot is added to the private channel (via @invite) or group. For direct messages use User ID from Slack profile.',
+        );
+      }
     }
 
     setIsSendingTestNotification(false);