Hello.

I'm seeking some config advice.

I am not the Listserv admin at our site, but I do manage the Postfix 
SMTP servers that Listserv forwards through.

I see thousands of these 450 errors in the logs everyday:

Jun  9 03:36:26 smtp-p2 postfix/smtpd[18435]: connect from 
listserv.wheaton.edu[192.138.89.115]
Jun  9 03:36:26 smtp-p2 postfix/smtpd[18435]: NOQUEUE: reject: RCPT from 
listserv.wheaton.edu[192.138.89.115]: 450 4.1.2 
<[log in to unmask]>: Recipient address rejected: Domain not 
found; 
from=<owner-remark-users*redacted*-redacted**WHEAETON*[log in to unmask]> 
to=<[log in to unmask]> proto=ESMTP helo=<listserv>
Jun  9 03:36:26 smtp-p2 postfix/smtpd[18435]: lost connection after RCPT 
from listserv.wheaton.edu[192.138.89.115]
Jun  9 03:36:26 smtp-p2 postfix/smtpd[18435]: disconnect from 
listserv.wheaton.edu[192.138.89.115]

I believe this is because Listserv tries to send via the SMTP server, 
ignores the 450 response from the SMTP server, and tries over and over 
again.

I can clear it up if I login to the Listserv box and delete all the mail 
for which I've seen this symptom, but that's a pain.

What is the recommended/normal way to setup a Postfix relay so that 
Listserv can figure out that it's trying to send to a bad domain and 
thus remove the mail from the queue?

Thanks!

-- 
Jeff Beaird
Network/Systems Engineer
Academic & Institutional Technology
Wheaton College, IL
office: 630-752-5454

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