Have 20 acc. on my server. Can send and receive all mail except from gmail.
When send mail to firstname.lastname@example.org
from gmail no mail arrives and gmail set's an error, but from all other it arrives ok.
Technical details of permanent failure:
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: 550 550-5.1.1 The email account that you tried to reach does not exist. Please try
550-5.1.1 double-checking the recipient's email address for typos or
550-5.1.1 unnecessary spaces. Learn more at...