[Mimedefang] Adding filter_helo support

[David F. Skoll]

Philip Prindeville wrote:

> Hmmm...  I'm looking at MXRelayOK, MXSenderOK, MXRecipientOK, etc.
> and wondering about why there's duplication of both passing the same
> arguments again (ip, name, helo, etc)...  As well as duplicating the
> validation logic for arguments...

Because the filter_relay, filter_sender and filter_recipient functions
might happen in different Perl slaves, so you can't (easily) store
state in your Perl filter.  It's easy to store the state in C and just
pass it in again each time.

--
David.