Unable to receive e-mails from outside accounts

Hi there!

I have setup the e-mail account: [email protected] using DirectAdmin.
I can log into the account using squirrel mail. I can send e-mails from [email protected] (via squirrel) to outside accounts. I can send and receive e-mails to/from other e-mail accounts on the same domain (using squirrel) e.g. [email protected].

BUT: I can not send e-mails to [email protected] from other accounts, such as [email protected]. What is wrong??

Thanks for your help!

/Mikael

The return message:

This is the Postfix program at host smtp-1.sys.kth.se.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The Postfix program

<[email protected]>: host mx01.trekia.se[79.99.4.41] said: 550 5.1.1
<[email protected]>: Recipient address rejected: User unknown (in reply
to RCPT TO command)
Reporting-MTA: dns; smtp-1.sys.kth.se
X-Postfix-Queue-ID: 855F81568DC
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Wed, 12 Nov 2008 17:47:21 +0100 (CET)

Final-Recipient: rfc822; [email protected]
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mx01.trekia.se[79.99.4.41] said: 550 5.1.1
<[email protected]>: Recipient address rejected: User unknown (in reply
to RCPT TO command)

Från: Mikael Sköldemar <[email protected]>
Datum: on 12 nov 2008 17.47.10 GMT+01:00
Till: Mikael Sköldemar <[email protected]>
Ämne: test t LW från isay


Testing 1234567!

Maybe this wil help dnsstuff

Especially look at the part of your mailserver

Thank you!

I'll forward this to my host!

can u send email to some other user @isayconsulting.com?

Looks like either [email protected] doesn't exists or the MX doesn't points to the right servers.