Kov?cs Albert:
> On Monday, March 9, 2015 4:21 PM, Noel Jones <[email protected]> wrote:
>
> > For performance reasons, postscreen does not do PTR lookups, nor
> > will PTR lookups be added to postscreen in the foreseeable future.
>
>
> I'm not sure how one (type of) dns query is a performance concern,
> and another is not, see below.
You see no performance difference between querying a small number
of well-operated DNS servers that are chosen by the local sysadmin,
versus random DNS servers all over the Internet that are determined
by the sender's IP address?
> I'd rather avoid this since I don't want zombies to occupy smtpd processes.
With postscreen, zombies don't get to occupy smtpd processes, by
using DNSBLs and pregreet tests.
Wietse
