[elspy] usual questions about suitability
amk at amk.ca
Thu Aug 19 17:56:44 CEST 2004
On Wed, Aug 18, 2004 at 08:55:19AM -0400, Eric S. Johansson wrote:
> the ability to rewrite recipients both in terms of number of and modify
> their e-mail addresses.
You can mutate the recipient list in a handler. I'm not sure what
Exim would do if you reduced the recipient list to length 0.
> This also includes the ability to declare a
> message as having vanished from the MTA's awareness (in other words,
> it's been consumed by the anti-spam filter).
You can raise RejectMessage to return an SMTP error. Returning an
SMTP OK while silently discarding a message strikes me as a very bad
idea; legitimate mail could be lost.
> the ability to limit the number of filter instances running at any one
No; elspy is embedded in Exim so multiple instances are always running
(unless you only have one Exim process). This means that the answer
to your follow-up question about running as a separate group is "no";
I don't think you can change the group and continue processing the
I would suggest the approach that elspy.spamassassin uses, opening a
local socket to a daemon that does the analysis. That way the daemon
can run under any group ID, and it can do its own serialization.
(Bonus: the MTA-specific glue is then fairly small, so it might be
possible to have glue for Exim, sendmail, and other MTAs.)
> the ability to distinguish which interface the traffic comes from or the
> ability to bind filter to interface.
The info dictionary passed to elspy handlers includes the IP address
on which a message was received, but not the interface name
(e.g. 'eth0'). I don't know if Exim has that information somewhere in
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