[afnog] cannot send mail to self using outlook express

[SM]

Hi Delali,
At 07:28 14-01-10, Delali Nyarku wrote:
>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:
><mailto:username at domainname>username at domainname
>SMTP error from remote mail server after end of data:
>MX Servername : 550
>Administrative prohibition "

The server might have filtering rules that prohibit you from sending 
emails to yourself.

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

What does your postfix log say?

Regards,
-sm