I think you might get better results from a conference with the LISTSERV
administrator - explore the logs and track down the root cause. In other
words, figure out WHY the "domain not found" condition occurs - where
did the item originate that caused the message (which is rejected) to be
sent?

On 6/14/2019 4:49 PM, Jeff Beaird wrote:
> 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!

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