envelope-from

[Mark Sapiro]

On 4/30/19 3:27 AM, Nicola Piazzi wrote:
> Someone have a way to test in spamassassin envelope-from instead of from
> contained in headers ?
> 
> Mailscanner add envelope-from in header only when spamassassin altready
> scanned it


MTAs on final delivery are supposed to add a Return-Path: header with
the envelope sender address. Postfix does. See RFC 5321, sec 4.4 and
predecessors which says in part:

>    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.
-- 
Mark Sapiro <mark at msapiro.net>        The highway is for gamblers,
San Francisco Bay Area, California    better use your sense - B. Dylan