Whenever I sent a mail to my server, the following error is received
The original message was received at Sat, 3 Aug 2002 13:23:22 -0400
from eos.telenet-ops.be [195.130.132.40]

----- The following addresses had permanent fatal errors -----
<admin@thinkhosted.com>
(reason: 553 5.3.5 system config error)

----- Transcript of session follows -----
553 5.3.5 thinkhosted.com. config error: mail loops back to me (MX problem?)
554 5.3.5 Local configuration error


Anybody knows what's wrong? It's my first server and I only have it since yesterday, so please keep it simple.

Thank you

A possible (and very common) scenario:

Your emails is handled by two MXs. One MX received an email and it thought it was the lower priority MX, so it forwarded the email to the other MX. The other MX thought it was the lower priority MX too, so it forwarded the email back to the first MX.

Make sure you have your DNS configuration and email static routes right.

I only have one MX record, so that can't be the problem.
On the RedHat site I found I had to put servername and all aliases into /etc/sendmail.cw I did, but it still doesn't seem to work.
Do I have to insert all my domains, also the one the receive the mail ( thinkhosted.com in this example)?

I think you should. But then again I don't know sendmail very well.

Originally posted by Gyrbo
I only have one MX record, so that can't be the problem.
On the RedHat site I found I had to put servername and all aliases into /etc/sendmail.cw I did, but it still doesn't seem to work.
Do I have to insert all my domains, also the one the receive the mail ( thinkhosted.com in this example)?

Yes in /etc/mail/local-host-names or whatever file specified for confCW_FILE