Quote:
Originally Posted by RI Swamp Yankee
Try this link http://support.microsoft.com/kb/942495/en-us
and scroll down to Simple Mail Transfer Protocol (SMTP) errors
then Error Code 0x800CCC69 and it gives this:
0x800CCC69 IXP_E_SMTP_550_MAILBOX_NOT_FOUND Mailbox not found
Looks like Server: 'mail.myfairpoint.net' doesn't recognize you. Make sure all your stttings are correct. Since you can connect to webmail you know your account still exists. I know the last thing you want to do is call a company that is in Chapter 11. 
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You're keying in on the wrong part of the error message. The 0x800CCC69 part is a very generic error message that you get for all kinds of can't-send-email problems.
The part of the message the is worth Googling is "This message does not comply with required standards", which basically leads to results that imply there is some kind of outbound filtering being applied, presumably to try and eliminate spam. The root cause is most likely a server misconfiguration on Fairpoints part, as that error message looks like a mail-server, not Outlook, generated result.
This is also in the category of issues that sometimes comes and go unexpectedly as technicians try to adjust things on the back end.