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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