Re: Exchange Server Virus Scanning

[Jeremy Mooney <j-mooney () BETHEL EDU>]

Graham Toal wrote on 2006/02/17 13:36:
> If you are looking at commercial appliances, do ask if they
> can offer greylisting.  It really is worth it.  There's a
> couple of small gotchas however.  One is that if you have
> multiple spamfilter or mail servers and they are load balancing
> (equal valued MX records, or hardware load-balancing like an F5)
> then you *must* get a greylist solution which shares its state
> between the multiple servers in real time, otherwise you can
> have senders back off to a different MX host and end up suffering
> multiple greylist retry delays.
>
> I'm not aware of any freeware systems that do this properly.

milter-greylist (http://hcpnet.free.fr/milter-greylist/) handles this well.

--
Jeremy Mooney
ITS - Bethel University