On Sat, May 10, 2008 at 12:16:03AM +0200, Heiko Schlittermann wrote: > Hello David,
>
> David Woodhouse <dwmw2@???> (Do 08 Mai 2008 14:10:21 CEST):
> >
> > It means that you shouldn't include the originating IP address as one of
> > the criteria for matching emails. I use {sender,recipients,message-id}.
>
> But this means that you're greylisting in your DATA acl (to get the
> message id). Didn't you experience problems with returning a 4xx there?
> I'm talking about serious operated MTAs being choked on 4xx after
> sending the final dot. (Despite the fact that some RFC allows 4xx at
> this point.)
What kind of problems would you expect to see?
We've been running greylisting in our DATA ACL for several years now
on a heavily loaded mail server and have never had any reports of problems.
