username: capnpip domain: michaelstcyr.com server: johnny I mentioned this within another question, but is separate from that issue... and also a much bigger problem that I realized should be addressed separately. This affects even webmail, so is unrelated to the IMAP/SMTP issues I am having with Thunderbird. I have received email to the addresses I have created, but only from certain senders. For example, notification+y2rrqena@facebookmail.com and confirm@twitter.com have successfully been received by social[at]michaelstcyr.com, as well as from my wife's yahoo.com account, but gmail.com fails. The email from Twitter had a 5 hour delay from the time it was sent, but did eventually arrive. When an email is sent from certain addresses, it returns the following error: Delivery to the following recipient failed permanently: social[at]michaelstcyr.com Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain michaelstcyr.com by michaelstcyr.com. [64.62.211.131]. The error that the other server returned was: 550-Verification failed for <myaddress@gmail.com> 550-No Such User Here 550 Sender verify failed And I'm sure this is obvious, but I replaced @ with [at] for my email address while posting here, I did not try to send the email like that.