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 ############################ 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