On Fri 05/Jul/2024 23:21:17 +0200 Jeff Pang via mailop wrote:
OT question, can return-path be customized by sender MTA/MUA? Or must it be envelope?
Return-path, envelop sender, bounce address and MAIL FROM are all synonyms for the same thing.
Mailing lists always change it when they forward a message. Mass mailers do so as well.
Some plain forwarders, à la dot-forward, change it, either to satisfy SPF (SRS) or in order to have bounces reach someone who can remove the relevant forwarding recipe when its target is removed at the other end. Some others keep it intact, in order to let the original sender become aware of bounces (and thus reveal the final destination.)
Best Ale -- _______________________________________________ mailop mailing list mailop@mailop.org https://list.mailop.org/listinfo/mailop
