OT - Greylisting (was: Re: gOCR SpamAssassin plugin)

[Denis Croombs]

> >> Greylisting decreases load immeasurably on a mailscanner 
> system, the 
> >> cost of greylisting is much less then allowing the message to go 
> >> through the mailscanner sytem. I deployed it several 
> months ago, it 
> >> really is a good tool, and I've had very few complaints 
> (10000 users).
> > 
> > I just use Sendmails greet pause which is 10 seconds to set up and 
> > works a treat - does greylisting add significant control or 
> > improvement over that?  Anybody using them in tandom or is 
> one or the 
> > other to be preferred?
> 
> I use both, and I have had to turn the greetpause setting 
> down to about
> 2 or 3 seconds, as some systems (such as NTMail) don't check 
> properly for the welcome message before sending the HELO or 
> EHLO. At that sort of setting, it has little benefit. And 
> there is no easy way to set up a whitelist with greetpause.
> 
> Greylisting (using milter-greylist) has a superb little 
> whitelist facility, and shares the current greylist database 
> between multiple MX's with minimal effort, using a TCP 
> connection between each one.

I have been trying to install milter-greylist all day on my sendmail 8.12 &
8.13 systems (Redhat & Centos mixture), but keep getting the error "checking
for smfi_register in -lmilter -lsm... no
checking for smfi_register in -lmilter -lsmutil... no
Required libmilter not found. Use --with-libmilter"

I have tried google, but as yet have not found the answer, has any kind
person give me a clue ?

Thanks

Denis