v0.0.2

src/routes/send.rs

@@ -117,6 +117,13 @@ pub async fn send_message_handler(
 
     // Build SMTP credentials from the authenticated account session.
     // Server endpoints are resolved from RustBox configuration at login and stored in the session.
+    // Normal login falls back from an unset smtp_host to the IMAP host, but reject
+    // an empty endpoint defensively for stale/legacy sessions.
+    if session.smtp_host.trim().is_empty() {
+        return Err(AppError::ServiceUnavailable(
+            "SMTP server is not configured for this account".to_string(),
+        ));
+    }
     let smtp_creds = SmtpCredentials {
         host: session.smtp_host.clone(),
         port: session.smtp_port,