Milter-greylist

> I am running sendmail/MimeDefang and recently added milter-greylist as
> an additional spam check. The domains in question are regularly hit
with
> dictionary-attack type spam where most of the target users don't
exist.
>   Sendmail is very quick at rejecting local addresses that are not in
> the aliases or virtuser tables so that is normally not a problem, but
> when milter-greylist is active it wants to greylist even the
> undeliverable addresses.  For the moment I am working around it by
> tracking the 'real' users, including them in the milter-greylist
config,
> and restricting greylisting to the specified addresses.  However, it
> would be nicer if this could be handled automatically by letting
> sendmail reject addresses it can't deliver first.  Is there any way to
> do that?
 
I am using the FEATURE(`access_db') in the
sendmail configuration file.
All the e-mails are rejected per default in the access
file for my inbound e-mail domains and only the known
addresses are listed explicitly as allowed to relay to.
This configuration does the job. No entries in the
greylist.db file for e-mail addresses which are not
listed in the access file.