I think it is a necessary item if you are going to successfully deliver email to many recients since many use reverse DNS to confirm authenticity of originating email. Gabriel Rincón CTGInc.net From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Christine Allen Sent: Friday, October 26, 2007 8:28 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Reverse DNS Look-up and Mail Just a question. How many folks out there have reverse DNS lookup set-up for their domains to support mail? Regards, Christine Allen, MCSE Engineer II MicroData Group, Inc. 100 Cummings Center, Suite 146N Beverly, MA 01915 Voice 978.921.0990 x234 Fax 978.921.0950 http://www.microdata.com <https://obiwan.microdata.com/exchweb/bin/redir.asp?URL=http://www.microdata.com>