Email error messages
----- The following addresses had permanent fatal errors -----
(reason: 550 ... User unknown)
This error message means that the server does not recognize the mailbox. Probably due to a typographical mistake or because the mailbox was deleted.
: connect to test.test.com[111.111.11.11]: Operation timed out
This means that the period of time during which the email can be sent has been exceeded. It could result from a slow or unstable internet connection.
Delay reason: mailbox is full.
This signifies that the mailbox is full and is unable to receive any new mail.