RE: Reverse DNS

  • From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Sat, 13 Nov 2004 14:51:02 -0600

Its good to see that an ever increasing number of e-mail admins are
understanding that reverse DNS lookups are bad. There are much much
better and more reliable ways to blocking spam without blocking
legitimate senders. 

Tom and Deb Shinder's Configuring ISA Server 2004
MVP -- ISA Firewalls

-----Original Message-----
From: Shawn Moua [mailto:smoua@xxxxxxxxxxxxxxx] 
Sent: Friday, November 12, 2004 6:08 PM
To: [ExchangeList]
Subject: [exchangelist] RE: Reverse DNS


This will help block spam but will also block legitimate emails as well.
I would advise you to not use it because of this very reason.  There are
a lot of businesses out there that don't have reverse dns entries (or
setup correctly anyways)...Try looking into good third-party email
filtering software.

Shawn M.

> -----Original Message-----
> From: Darren Haun [mailto:dhaun@xxxxxxxxxxxxx]
> Sent: Thursday, November 11, 2004 7:15 AM
> To: [ExchangeList]
> Subject: [exchangelist] Reverse DNS
> How do you set up Reverse DNS on your Exchange Server to reject
> that don't correspond to the IP address/Reverse DNS entry.  This
tactic is
> usually used to block spam.

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