David F. Skoll wrote: > On Tue, 17 May 2011 09:46:09 +0200 > Per Jessen <p...@computer.org> wrote: > >> The main/only problem I have with greylisting are otherwise legit >> servers that don't do retries - usually unpatched Exchange 2003 >> servers. > > I've never seen any Exchange server of any version fail greylisting. > (Again, I do it post-DATA which might explain it.)
(I greylist before DATA.) I think I see a new one about perhaps once a month. The Exchange server will build up a queue of emails and NDRs, which is only released when the server is restarted. I'm pretty certain this is the applicable hotfix: http://support.microsoft.com/kb/950757/ /Per Jessen, Zürich
