Can't receive mail

[Lite-On]

yesterday I have installed ISPConfig on my Centos 4.5 server.
Everything is working fine, but only postfix has some problems.

When I send an e-mail to "support@mydomain.nl", I get the following error:

This is the Postfix program at host web1.

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

<web2_support@web1.web1> (expanded from <support@www.mydomain.nl>): Host or domain
    name not found. Name service error for name=web1.web1 type=A: Host not
    found

I have try 2 e-mails, but I get the same error.
support@mydomain.nl
support@www.mydomain.nl

I have more domains, and I get this error in al my e-mails.
Sending e-mails via webmail is not a problem.
Only receiving is a problem

Anybody who can help me out

[till]

The hostname of your server "web1.web1" is not available in DNS. Please make sure that web1.web1 is created in DNS and points with a A-Record to the IP address of your server.

[kreya]

look what's in the /var/log/mail.log . that should show you the problem

[Lite-On]

Originally Posted by till

The hostname of your server "web1.web1" is not available in DNS. Please make sure that web1.web1 is created in DNS and points with a A-Record to the IP address of your server.

Thanks!

This has solved my problem