Sunil Shetye <shetye(_at_)bombay(_dot_)retortsoft(_dot_)com> writes:
In fact, I have noted that when a MAIL FROM: <> is sent to the mailbox
on my popservername, the Return-Path: is stored as
<MAILER-DAEMON(_at_)popservername> and not <>! Then, when fetchmail gets
that mail, the from address is <MAILER-DAEMON(_at_)popservername>. I have
not checked who is doing this rewriting and why.
Some "smart" software does that, for example ISODE PP. Your popserver is
broken. What MTA software runs there?
It's not necessary and should NEVER happen. If the envelope sender is
empty, it must always remain empty. This cannot be argued over. Do it
differently and suffer.
So, my opinion is that no harm is done if <> is converted to
MAILER-DAEMON (and eventually to <MAILER-DAEMON(_at_)popservername>).
It is harmful and can cause mail loops. Been there, seen those even
without fetchmail.
--
Matthias Andree