I came across this KB article which contains a list of error codes that may occur in Windows Mail or in Windows Live Mail. The list contains the following categories:

• Error code  • Error type • Description

The list of error codes may be returned in Windows Mail or in Windows Live Mail if a failure occurs when you send mail or when you receive mail. The list contains, General errors, Winsock errors, SMTP (Simple Mail Transfer Protocol) errors, HTTPmail errors, NNTP (Network news Transport Protocol) errors, Remote access errors, IMAP (Internet Message Access Protocol) errors,