Exim Fallback

Hello,

Usually I don't have much problems configuring applications etc, but this time I'm totally out of ideas, so I hope anyone here could help.

The problem: A customer is running his own server, we provide domain+dns. The A records all point to his own server, except for one subdomain: backupmail.clientdomain.ext, which points to our server. The DNS zone has two mx records, MX 10 clientdomain.ext and MX 20 backupmail.clientdomain.ext. So we are the customer's fallback.

Now we seems to have a small problem: our server is rejecting mail pointed to clientdomain.ext. Sending a test email trough telnet on port 25 shows us this:

Code: 
no4xs@xs3:~% telnet backupmail.clientdomain.ext 25
Trying 67.18.000.00...
Connected to backupmail.clientdomain.ext.
Escape character is '^]'.
220-hostname.ourdomain.ext ESMTP Exim 4.43 #0 Sun, 28 Nov 2004 11:49:57 +0100
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
helo xs4all.nl
250 hostname.ourdomain.ext Hello no4xs at xs4all.nl [194.109.21.4]
mail from: ***@otherdomain.ext
250 OK
rcpt to: ***@clientdomain.ext
550-xs3.xs4all.nl (xs4all.nl) [194.109.21.4] is currently not permitted to
550-relay through this server. Perhaps you have not logged into the pop/imap
550-server in the last 30 minutes or do not have SMTP Authentication turned on
550 in your email client.
quit
221 hostname.ourdomain.ext closing connection
Connection closed by foreign host.
To fix this, I have to add clientdomain.ext to the ACL config, I think (true?), but I have no clue how to add it. The explanation on exim.org made me even more clueless and I couldn't fin how to's/config examples anywhere.

Now I hope someone dealt with this before and can tell me how to fix this.

Thank you!

Jochem

 

 

 

 

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