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sendmail not delivering, deferred

I switched the IP address for our mail server and now some messages are not getting delivered. Most are OK, but it superficially appears that messages to aol and roadrunner are having trouble. Here is an example:
Feb 20 08:34:32 mail sm-mta[17788]: t1KDYWkl017788: from=<matkeson@ohprs.org>, size=5075, class=0, nrcpts=1, msgid=<01d601d04d11$f4869d70$dd93d850$@ohprs.org>, proto=ESMTP, daemon=MTA, relay=MARK.hprs.local [192.168.0.55]
Feb 20 08:34:32 mail sm-mta[17788]: t1KDYWkl017788: Milter add: rcpt: allmail
Feb 20 08:34:32 mail sm-mta[17792]: t1KDYWkl017788: to=/var/spool/mail/allmail, ctladdr=allmail (2/0), delay=00:00:00, xdelay=00:00:00, mailer=*file*, pri=125075, dsn=2.0.0, stat=Sent
Feb 20 08:34:33 mail sm-mta[17792]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=00:00:01, xdelay=00:00:01, mailer=esmtp, pri=125075, relay=mailin-04.mx.aol.com. [152.163.0.68], dsn=4.0.0, stat=Deferred: 421 4.7.1 : (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html
Feb 20 08:46:51 mail sm-mta[17954]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=00:12:19, xdelay=00:00:01, mailer=esmtp, pri=215075, relay=mailin-01.mx.aol.com. [152.163.0.68], dsn=4.0.0, stat=Deferred: 421 4.7.1 : (DNS:NR) http://postmaster.info.aol.com/errors/421dnsnr.html
Feb 20 09:11:51 mail sm-mta[18318]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=00:37:19, xdelay=00:00:00, mailer=esmtp, pri=305075, relay=mailin-04.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 09:36:52 mail sm-mta[18578]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=01:02:20, xdelay=00:00:00, mailer=esmtp, pri=395075, relay=mailin-04.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 10:01:52 mail sm-mta[18896]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=01:27:20, xdelay=00:00:00, mailer=esmtp, pri=485075, relay=mailin-01.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 10:26:51 mail sm-mta[19338]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=01:52:19, xdelay=00:00:00, mailer=esmtp, pri=575075, relay=mailin-01.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 10:51:52 mail sm-mta[19613]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=02:17:20, xdelay=00:00:00, mailer=esmtp, pri=665075, relay=mailin-02.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 11:07:27 mail sm-mta[19887]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=02:32:55, xdelay=00:00:00, mailer=esmtp, pri=755075, relay=mailin-04.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 11:29:44 mail sm-mta[20133]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=02:55:12, xdelay=00:00:00, mailer=esmtp, pri=845075, relay=mailin-04.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 11:54:57 mail sm-mta[20469]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=03:20:25, xdelay=00:00:00, mailer=esmtp, pri=935075, relay=mailin-03.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 12:19:45 mail sm-mta[20857]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=03:45:13, xdelay=00:00:00, mailer=esmtp, pri=1025075, relay=mailin-04.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 12:48:59 mail sm-mta[21261]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=04:14:27, xdelay=00:00:00, mailer=esmtp, pri=1115075, relay=mailin-01.mx.aol.com., dsn=4.0.0, stat=Deferred
Feb 20 12:48:59 mail sm-mta[21261]: t1KDYWkl017788: t1KHihek021261: sender notify: Warning: could not send message for past 4 hours
Feb 20 13:14:00 mail sm-mta[21653]: t1KDYWkl017788: to=<mra8@aol.com>, ctladdr=<matkeson@ohprs.org> (3000045/100), delay=04:39:28, xdelay=00:00:00, mailer=esmtp, pri=1205075, relay=mailin-01.mx.aol.com., dsn=4.0.0, stat=Deferred

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I'm not seeing this exact message when searching the net. Most examples have "connection timeout" or "connection refused", which is not the case here.

Why is the status deferred?
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jmarkfoley
Asked:
jmarkfoley
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2 Solutions
 
Will SzymkowskiSenior Solution ArchitectCommented:
I switched the IP address for our mail server and now some messages are not getting delivered
Are you referring to your External IP address for your mail server? If this is the case you will also need to ensure that your Reverse DNS is setup accordingly as well. This could be why your emails are not making it to some domains.

Will.
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Jan SpringerCommented:
This is exactly why they are not getting delivered.

The fqdn of the server and forward/inverse DNS should match.

You can see that errors in your logs.
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Will SzymkowskiSenior Solution ArchitectCommented:
You will need to contact your ISP to ensure that your Reverse PTR records are correctly assigned.

Will.
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jmarkfoleyAuthor Commented:
What I did instead of contacting the ISP (who sucks) is to switch the new mail server to the same IP as the old mail server (which is now offline). I did appear that some of the messages got delivered. I will monitor until tomorrow then post back.
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jmarkfoleyAuthor Commented:
That looks like it did the trick. I suppose I should have remembered that, but the last time I had to get the ISP to put a reverseDNS record in was 5 years ago.
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