Troubleshooting Connection Issues

When the mailbox does not connect

MailDesk shows you the connection status of each mailbox. Here are the most common problems and their solutions.

"Authentication failed" / Login failed

• Gmail: You need an app password, not your normal Google password. Create one at myaccount.google.com → Security → App Passwords.
• Outlook/M365: Check if IMAP is enabled in the Admin Center. If MFA is required, you need an app password.
• General: Check if the username and password are correct. Some providers use the full email address as username.

"Connection timed out" / Timeout

• Check if the IMAP port is correct (993 for SSL, 143 for STARTTLS)
• Make sure no firewall is blocking the port
• Test the connection with the "Test connection" button

"Certificate error" / Certificate error

This indicates an invalid or self-signed SSL certificate. Contact your email provider to renew the certificate.

Mailbox was connected, now no longer

Most common cause: The password was changed or an app password was revoked. Update the credentials under Settings → Mailboxes → [Edit mailbox].