Hi Wietse, Makes sense! I guess sender_canonical_classes will work for us. I am trying to set this up for an emergency messaging system. Users can send emergency messages to groups either from outlook or post from a web application. The mail system has a high reputation.
If I change the envelop sender for mails from client's outlook in postfix, will that affect our email reputation in anyway.? Thanks Basil On Wed, Dec 9, 2015 at 11:59 PM, Wietse Venema <wie...@porcupine.org> wrote: > basil varghese: > > I have an SMTP application that handle mailing lists and it use postfix > > relay to send emails to end users. For some emails sent to some groups, > the > > "return-path" header is set to "from" header instead of "reply-to" > > According to Internet email RFCs(*), the Return-Path: header is > output only: it is created upon final delivery of an email message, > with value of the envelope sender address (the address in the "MAIL > FROM:" command, in terms of the SMTP protocol), and it is never > read for making delivery decisions. > > > I want my users receive the bounces only to "reply to" address. Is it > > something I can handle at postfix end. I want to rewrite the "return-to" > > path in each mail to the value found in "reply-to" > > According to Internet email RFCs, undeliverable mail is returned > to the address in the "MAIL FROM:" command, not some header address. > Therefore, you need to specify the correct envelope sender address. > If you want to do something non-standard like copy the envelope > address from some message header, that is not built into Postfix, > and will require a content filter. > > One mechanism that is built into Postfix is (sender_)canonical_maps. > With "sender_canonical_classes = envelope_sender", this can be used > to transform the sender envelope based on table lookup. > > Other mechanisms are built into mail clients. For example, choosing > the sender based on the content of the message or header. > > Wietse > > (*) Start with RFC 5321 and RFC 5322. > -- Regards basil
