Hi Wietse,
Thanks for the usual reply.
We have a situation when we need to send emails in behalf of some
customers using different domain.
My milter code (part of it):
CONTENT=$(cat)
VERP_SIGNER=`echo "$CONTENT" | grep 'X-VERP' | awk -F'[:]' '{print $2}' | xargs`
if [[ $VERP_SIGNER == 1 ]]; then
SENDMAIL="/usr/sbin/sendmail -i -f ${VERP_ADDRESS}"
else
SENDMAIL="/usr/sbin/sendmail -G -i"
fi
But when using -f ${VERP_ADDRESS} postfix keeps using original sender
from $CONTENT.
Am I doin something wrong?
Thanks once again.
BR,
Rafael
Em ter., 10 de dez. de 2024 às 12:25, Wietse Venema via Postfix-users
<postfix-users@postfix.org> escreveu:
>
> Rafael Azevedo via Postfix-users:
> > Hi there,
> >
> > I've made a milter that replaces some strings on specific message patterns.
> >
> > Now, I need to change the return-path accordingly to the VERP pattern
> > for each sent mail.
>
> The Return-Path header is added upon DELIVERY (it contains the
> envelope sender). It DOES NOT control where a message is delvered.
>
> Quotes from RFC 5321 (see also RFC 5322).
>
> When the delivery SMTP server makes the "final delivery" of a
> message, it inserts a return-path line at the beginning of the mail
> data. This use of return-path is required; mail systems MUST support
> it. The return-path line preserves the information in the <reverse-
> path> from the MAIL command. Here, final delivery means the message
> has left the SMTP environment. Normally, this would mean it had been
> delivered to the destination user or an associated mail drop, but in
> some cases it may be further processed and transmitted by another
> mail system.
>
> A message-originating SMTP system SHOULD NOT send a message that
> already contains a Return-path header field. SMTP servers performing
> a relay function MUST NOT inspect the message data, and especially
> not to the extent needed to determine if Return-path header fields
> are present. SMTP servers making final delivery MAY remove Return-
> path header fields before adding their own.
>
> To change the envelope sender with a milter use the CHGFROM primitive.
>
> To specify the envelope sender with the Postfix sendmail command
> use the -f command-line option.
>
> sendmail -f u...@example.com ...
>
> Wietse
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