Mailbox troubleshooting

What to do when mail doesn't arrive or can't be sent.

Steps

1. 1Open Settings → Mailboxes and check the status badges for Sending and Receiving.
2. 2“Sign-in failed”: check the username and password; many providers require an app password.
3. 3A mailbox is paused after 5 failed sign-ins in a row. Update the password, select Test sending and Test receiving, then Resume.
4. 4Nothing arriving? Check the watched folders and the import start time, then use Sync now in the inbox.
5. 5Sending fails with a secure-connection error: check the port and security setting (587 + STARTTLS or 465 + SSL/TLS).
6. 6Private or internal server addresses are blocked for security; use the server's public host name.

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