Apple Mail has a relatively small number of errors that it will display when compared to Outlook. This section has been broken down into general errors, success messages, incoming mail errors and SMTP or outgoing email errors. The majority of theses errors are found in the Connection Doctor.

In some cases the errors are generalized and do not specifically identify the problem or one error could appear for multiple issues. Normally when a problem is encountered, mail displays one of two icons next to the account name or inbox if only one account is configured.

Click on one of the errors below for more information.

Connection Status:

• Mail was able to connect to the internet.
• Mail was unable to connect to the Internet. Click the "Network Diagnostics" button for help diagnosing the problem.

SMTP

• Trying to log in to this SMTP account failed. Verify the username and password are correct.
• Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences.
• Could not connect to this SMTP server. Check your network connection and that you entered the correct information in the Account preferences. Also verify that the server supports SSL. If it does not, deselect the "Use SSL" checkbox in the Advanced tab of Account preferences.

Incoming

• Unable to Receive Mail The mail server denied access to the account "______" because an administrator or other mail client was using it when Mail tried to log in. Try again later. The server returned an error: account is locked by another session or for maintenance, try again.
• Trying to log in to this POP/IMAP account failed. Verify that the username and password are correct.
• The account "_____" appears to be offline due to a network problem. Do you want to try go online now?
• Could not connect to this POP/IMAP server. Check your network connection and that you entered the correct information in the Account preferences.
• Could not connect to this POP/IMAP server. Check your network connection and that you entered the correct information in the Account preferences. Also verify that the server supports SSL. If it does not, deselect the "Use SSL" checkbox in the Advanced tab of Account preferences.

Success

• Connection and login to the server succeeded.
• Connection to the server succeeded; login not required.
• Waiting to check. (IMAP, login successful)