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Relaying denied. IP name lookup failed

Posted on 2007-11-30
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Last Modified: 2013-12-17
I'm getting the below error and I've been on the phone with Red Hat for over 2 hours and they cannot figure it out. It seems like a simple question, wWhy is relaying being denied? Here's the entry in the /var/log/maillog

Nov 30 08:58:35 mammoth sendmail[13583]: lAUGwYMT013583: ruleset=check_rcpt, arg1=<user@gmail.com>, relay=[66.51.204.153], reject=550 5.7.1 <user@gmail.com>... Relaying denied. IP name lookup failed [66.51.204.153]

The domain name is geoffandcindy.com and it has a valid MX record.  The local-host-names has the domain in it 'geoffandcindy.com' and sendmail.mc has the following special options enabled along with the normal other ones:
define(`confAUTH_OPTIONS', `A p y')dnl
TRUST_AUTH_MECH(`LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `LOGIN PLAIN')dnl
define(`confTO_IDENT', `0')dnl
FEATURE(delay_checks)dnl
FEATURE(`no_default_msa',`dnl')dnl
FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`mailertable',`hash -o /etc/mail/mailertable.db')dnl
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
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Question by:Geoff Millikan
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Expert Comment

by:robocat
ID: 20392219

Why don't you add 66.51.204.153 to your reverse DNS lookup zone ?
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Author Comment

by:Geoff Millikan
ID: 20393915
Mail will be sent from many IP addresses since our users travel...  So IP address stuff will not work.
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robocat earned 500 total points
ID: 20394299


Try

define(`confAUTH_OPTIONS', `A y')dnl

or

define(`confAUTH_OPTIONS', `A')dnl
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