Hi, I would think if you are relaying mail for multiple domains then you may not need to. I relay/handle mail for many sub domains of uconn.edu and some don’t have PTR records.
If it is not a sub domain I think you should follow best practice, and my guess is yes you want DNS configured as completely as possible. -ANGELO FAZZINA ITS Service Manager: Spam and Virus Prevention Mass Mailing G Suite/Gmail ang...@uconn.edu University of Connecticut, ITS, SSG, Server Systems 860-486-9075 From: owner-postfix-us...@postfix.org <owner-postfix-us...@postfix.org> On Behalf Of Tobias Koeck Sent: Wednesday, May 9, 2018 11:36 AM To: postfix-users@postfix.org Subject: Ptr DNS and domains Hi, if I want to use several domains on my Postfix server do every domain need a unique PTR DNS entry to an unique IP or is it enough to setup $myhostname to the main domain? smtp_helo_name = $myhostname smtpd_proxy_ehlo = $myhostname Greetings Tobias
