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! ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1