When i try to send and recive mail to an mail server @swipnet.se i got this error:
email@example.com på 2007-07-27 10:50
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<Mailserver.domain.local #5.5.0 smtp;573 Administrator@company.se unknown user account>
I can send to other domains, and i recive mail from other domains
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