How do I troubleshoot IMAP authentication errors?

Steps

1. Make sure IMAP access is turned on at your provider.
2. Check the IMAP Host, IMAP Port and Encryption: SSL usually uses port 993; TLS (STARTTLS) and None usually use port 143.
3. Check the IMAP Username (often the full email address) and IMAP Password. Some providers require an app password.
4. Correct the details with Edit in Email Accounts and click Update Account.
5. Run Test authentication.

Good to know

• While the IMAP login fails, replies and bounce reports are not detected for that account, and its warmup pauses for a few hours.
• For MailRush email accounts, open a support ticket with the test result.