RE: [cobalt-users] Raq550: How do we Block spam with reverse DNS checks

["Dan Kriwitsky" <list1@xxxxxxxxxxxxxxxxxxxx>]

> In the beginning of September 2003 a national realty company 
> (kw.com) started checking incomming email for reverse DNS 
> settings to help stop spam.  They report that most of the 
> spam has been blocked.  Only a few companies that did not 
> have any reverse DNS settings had problems but those 
> companies have fixed them thier dns settings.  Is there a way 
> that Raq550 owners can block Email from servers with no 
> reverse DNS settings?

This blocking was discussed in news.admin.net-abuse.email and many
reported having to abandon it as too much legit mail was being blocked
and it was an administrative headache.
You might want to tail your maillog for a while and see what email is
coming in with no rDNS and do a whois on the IPs. I could probably get
away with it on my server, but I would hesitate to block customer email
that way.

-- 
C2003 Dan Kriwitsky

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