Hi to all While being in the middle of adjusting Postfix at my server, I have faced with such a problem: it does not receive emails from gmail. Emails from other services (live, mail, corporate, etc.) are received normally. Gmail's response if following: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 451 451 4.7.1 Service unavailable - try gain later (state 17). Had anyone such an issue? Please advise on how to fix it. I have Fedora 8 + Postfix + Dovecot + Spamassasin installed.