Some errors in /var/log/maillog

[Keith Morse]

On Fri, 5 Sep 2003, Bill Campbell wrote:

> On Fri, Sep 05, 2003, Swapana Ghosh wrote:
> >Thanks you very much.
> >
> >-Swapna
> >
> >> 
> >> Reverse lookup failed?  the zone for xxx.xxx.xx.35 (and others) doesn't 
> >> have any PTR records for that ip or the zone does not exist on any dns 
> >> server.
> 
> BTW:  This is an excellent criteria for spam blocking, particularly since
> AOL is now doing it which makes it much easier to tell an ISP to get their
> sh*t together and fix their DNS.  If an ISP can't get the rDNS configured
> for the mail servers, they probably shouldn't be running them.
> 

Excellent criteria, If you could get a response from the domain's admin 
after mailing them to let them know their DNS is broken.  And your 
customers didn't get business critical email from those broken domains.  
There are a lot of broken but valid dns domains out there.

Been there, done that, got the teeth marks on my butt.