[afnog] cannot send mail to self using outlook express

[Delali Nyarku]

Hello,

My mail system has been working fine but all of a sudden I cannot send mails
to my e-mail address using outlook express and microsoft outlook. I can send
mails to other accounts on the mail server in question and to other
addresses outside my domain

I receive the following error message when i send to my e-mail address


"This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
username at domainname
SMTP error from remote mail server after end of data:
MX Servername : 550
Administrative prohibition "

I am using zimbra with postfix on the mail server and exim on the MX
servers.

Please assist.
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