Milter-greylist

> > [...]Do not use 4.7.1 as enhanced status code because
> > some broken systems misinterpret it as a permanent error.[...]
> > 
> > So, was wondering why milter-greylist uses that???
> 
> Because nobody ever read that doc here. What error code do you suggest?

The sendmail authors switched from 4.7.1 (transient error, security or
policy status, delivery not authorized) to 4.3.2 (transient error, mail
system status, system not not accepting network messages).

Details of enhanced status codes are in RFC 1893; while 4.7.1 is
technically correct, making the remote system think 4.3.2 applies is
friendlier to broken MTAs and shouldn't affect spamware significantly.
It might actually help since 4.3.2 as an enhanced status code is valid
for reasons other than anti-spam filtering (e.g. system load too high
to accept mail) and 4.7.1 is pretty much restricted to anti-spam
measures.

--
Dawn Keenan, IST, University of Waterloo