Stuart D. Gathman wrote:
[An MTA maintainer] *should* be interested in allowing user extensions
(via postfix policy daemons or milter api) to modify MAIL FROM.
I'd still be interested in knowing what an API to modify MAIL FROM
might look like. I'm not quite familiar with neither postfix nor
sendmail (I use Courier).
I change the MAIL FROM via a -f command line switch, and I do it upon
delivery, i.e. after accepting responsibility for delivering the
message. For example, I have ".courier" files (similar to ".forward")
and for SPF compliance I had to substitute lines like
forward(_at_)example(_dot_)com
with
|/usr/sbin/sendmail -f postmaster(_at_)mine forward(_at_)example(_dot_)com
Using milter apparently implies doing it earlier. Is that right after
the MAIL FROM(!?), after RCPT, or after DATA?
Sometimes, I forward based on specific message contents, using
maildrop, that's the reason why I find it more natural to do it after
the message has been accepted. What are the pros of doing it "online"?
Proposals should distance themselves from specific applications. If an example
is needed to show why it would be useful to modify MAIL FROM, pick
one like BATV, since SRS seems to have accumulated bad vibes in his mind.
Can that be understood in an MTA-independent manner? You already
mentioned a number of different policies (i.e. BATV, SRS, ecc.) that
can be applied according with different strategies (i.e. after RCPT,
after DATA, after acceptance), thus an MTA-wise fragmentation on top
of that is quite an hindrance for any development.
In other words, if we had a nice program that did The Right Thing for
each forwarded recipient, how would we fit it into our differing MTAs?
I assume that, in order to fix forwarding, we aim at designing such a
program. If not, please tell me what are the alternatives.
TIA
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