Hi, I have a domain that has MX point to O365 and then O365 relays mail to Postfix server. Currently, Postfix does a lookup in a MySql table to know where to relay the email to, AFA next hop. If not found in table Postfix looks up MX and relays the email.
I want to know if there is a more graceful way of dealing with mail loops caused by sending to invalid addresses ? Example: A. TO: realu...@test.domain.com<mailto:realu...@test.domain.com> -> O365 -> postfix -> relay to destination server [cuz found in table] B. TO: fakeu...@test.domain.com<mailto:fakeu...@test.domain.com> -> O365 -> postfix -> lookup MX and relay [cuz not found in table ] ->O365 -> Postfix -> you get the idea For "B" I tested and it finally sends me the bounce back after 9 loops [216.32.180.170] said: 554 5.4.14 Hop count exceeded - possible mail loop ATTR1 Is there a savvy setting in Postfix to deal with this scenario [ like telling postfix, for this domain, if you don't find entry in table bounce and don't look up MX ?] Or is Postfix already doing the best it can. Thank you. -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
