Anyone using zen.spamhaus.org?

[Jim Holland]

On Thu, 7 Sep 2006, Res wrote:

> > Actually I had the most trouble with foward and reverse DNS. I turned
> > that off because my whitelist had grown to over a couple hundred
> > entries. With greylisting I've only had to add 5 or 6 domains.
> 
> the vast majority of failed attempts come from no PTR's and those that 
> dont have them, tends to indicate lazy network admins so i wouldnt expect 
> them to take action on spammers either, I simply whitelisted .gov.au
> in sendmail and qmail and alls been happy since, AOL also still do this i 
> understand, so the collateral damage cant be all that bad if tehy still do 
> it :)

I use the RDNS etc checks as a kind of poor man's greylisting - I give a
451 to all errors and then let them try again at our higher MX.  That
minimises the need to do whitelisting.

Regards

Jim Holland
System Administrator
MANGO - Zimbabwe's non-profit e-mail service