basil varghese:
> 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.
In that case you should set the envelope sender on ALL messages
from the alerting system, just like mailing lists do (see the headers
of this email message: the return-path address is owner-postfix-users@).
This requires zero changes to Postfix, and should be done by the
sending application.
Wietse
> 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
