Hi, I use postfix version 2.6 or 2.10 I forget Can you test setting these settings ? In main.cf
#relay_domains = test.uconn.edu $mydestination #relay_recipient_maps = hash:/etc/postfix/relay_recipients tfix]# more relay_recipients angelo.fazz...@test.uconn.edu OK Not sure is virtual_alias_domains setting may help you as well ? Good Luck. -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 -----Original Message----- From: owner-postfix-us...@postfix.org [mailto:owner-postfix-us...@postfix.org] On Behalf Of phep Sent: Tuesday, March 20, 2018 9:42 AM To: postfix-users@postfix.org Subject: Howto configure Postfix to relay messages from a specific email address Hi, Let's say my domain is example.com. We have a bunch of servers that are authorised to use our SMTP server to relay their mail to the outside with something like : mynetworks: 192.168.250.0/24 So far, so good. Now I have a sister organisation with domain example2.com that operates a web app than needs to send mail through our Postfix server and I want to relay mails sent from this web app provided the messages sender meets a specific email address (say web...@example2.com). How can I do that in main.cf ? Simply adding the web app server IP to mynetworks would not do the trick since I'd rather not relay any email traffic from this server, only this webapp messages (notwithstanding fake headers). I read through smtpd_reject_unlisted_recipient and smtpd_relay_restrictions documentation but could not figure out how to do it. Thanks in advance, phep
