Unrouteable mail domain from listserv


Well-Known Member
Sep 26, 2006
cPanel Access Level
Root Administrator
One of my accounts is trying to receive email from a listserv, but the listserv sender is getting the following error in their mail log:

Mon, 16 Jul 2007 20:49:31 Sending email to: [email protected]<mailto:[email protected]>
<-- DNS info available for: mydomain.com
--> Attempting to connect to: mydomain.com (12.34.567.89 25)
# I changed the IP address for this post
<-- Connected to: mydomain.com (12.34.567.89 25)
<-- 220-server1.myserver.com ESMTP Exim 4.63 #1 Mon, 16 Jul 2007 20:51:20 -0400
<-- 220-We do not authorize the use of this system to transport unsolicited,
<-- 220 and/or bulk e-mail.
--> HELO lists.theirdomain.com
<-- 250 server1.myserver.com Hello lists.theirdomain.com []
# I changed the IP address here, too
[email protected]<mailto:[email protected]>
<-- 250 OK
--> RCPT TO:<[email protected]<mailto:[email protected]>>
<-- 550-Verification failed for <[email protected]<mailto:[email protected]>>
<-- 550-unrouteable mail domain "lists.theirdomain.com"
<-- 550 Sender verify failed

The listserv provider said that they've had this problem before, and that the error is on my end. Is this true? If so, how do I correct it? Is this an exim setting, or SpamAssassin?

Is their a way to whitelist lists.theirdomain.com?

It's worth knowing that all other emails are OK.