I'm running Mailman 2.1.7

In the past month or two.  I'm seeing Mailman delaying sending out messages.  
In the logs I see where it's posted, then in /var/logs/maillog I see sending 
start immediately and then somewhere along the line a delay of an hour or two, 
then it finishes sending. Or it delays initially then starts sending.
This hasn't been happening in the past.  We in the process of moving a lot of 
our mail users to O365
Not sure what's going on or how best to troubleshoot.  Any ideas?

Bruce Harrison
Univ of Tennessee at Martin

Post Log
Mar 03 13:34:57 2017 (1223) post to information from mun...@utm.edu, 
size=37061, 
message-id=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
success log


/var/logs/maillog
Mar  3 09:11:23 mailman sendmail[17197]: v23FBNsO017197: from=<mun...@utm.edu>, 
size=35583, class=0, nrcpts=1, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, 
relay=mail-dm3nam03lp0023.outbound.protection.outlook.com [207.46.163.23]
Mar  3 13:34:56 mailman sendmail[22801]: v23JYu9r022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=150, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:34:56 mailman sendmail[22801]: v23JYu9s022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=500, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:34:57 mailman sendmail[22801]: v23JYu9t022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=500, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:34:57 mailman sendmail[22801]: v23JYu9u022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=500, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:34:57 mailman sendmail[22801]: v23JYu9v022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=8, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:34:57 mailman sendmail[22801]: v23JYu9w022801: 
from=<information-boun...@mailman.utm.edu>, size=37061, class=-30, nrcpts=7, 
msgid=<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu>, 
proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] (may be forged)
Mar  3 13:35:02 mailman sendmail[22811]: v23JYu9v022801: 
to=<trinitypr...@frontiernet.net>,<mcoch...@wljt.org>,<khi...@utfcu.org>,<trinitypas...@frontiernet.net>,<mshum...@wljt.org>,<mnpe...@comcast.net>,<mre...@wljt.org>,<mfi...@charter.net>,
 delay=00:00:05, xdelay=00:00:05, mailer=relay, pri=331061, 
relay=xmail.utm.edu. [10.51.0.154], dsn=2.0.0, stat=Sent 
(<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu> 
[InternalId=7717462] Queued mail for delivery)
Mar  3 13:35:02 mailman sendmail[22805]: v23JYu9s022801: 
to=<thibb...@utm.edu>,<clove...@utm.edu>,<dahen...@utm.edu>,<mbro...@utm.edu>,<afull...@utm.edu>,<kroud...@utm.edu>,<bjohn...@utm.edu>,<nda...@utm.edu>,<jimer...@utm.edu>,<sburl...@utm.edu>,<thutc...@utm.edu>,<hche...@utm.edu>,<nashb...@utm.edu>,<mpari...@utm.edu>,<jjohn...@utm.edu>,<tgall...@utm.edu>,<sgold...@utm.edu>,<agard...@utm.edu>,<ddietr...@utm.edu>,<jfish...@utm.edu>,<ahuff...@utm.edu>,<kwhee...@utm.edu>,<lmccur...@utm.edu>,<kelmw...@ut.utm.edu>,<khamm...@utm.edu>,<jscot...@utm.edu>,<arich...@utm.edu>,<rprui...@utm.edu>,<ewhee...@utm.edu>,<lgib...@utm.edu>,<shalk...@utm.edu>,<akel...@utm.edu>,<phew...@utm.edu>,<da...@utm.edu>,<drya...@utm.edu>,<jda...@utm.edu>,
 [more], delay=00:00:06, xdelay=00:00:06, mailer=relay, pri=15091061, 
relay=xmail.utm.edu. [10.51.0.154], dsn=2.0.0, stat=Sent 
(<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu> 
[InternalId=7717459] Queued mail for delivery)
.
.
.
Mar  3 13:35:30 mailman sendmail[22805]: v23JYu9s022801: 
to=<jjone...@utm.edu>,<pwatk...@utm.edu>,<dmccu...@utm.edu>,<dwilliams-b...@utm.edu>,<jbyr...@utm.edu>,<ajohn...@utm.edu>,<jgoy...@utm.edu>,<sh...@utm.edu>,<mgib...@utm.edu>,<jhend...@utm.edu>,<bgi...@utm.edu>,<lwar...@utm.edu>,<mtray...@utm.edu>,<ble...@utm.edu>,<jjohn...@utm.edu>,<rjo...@utm.edu>,<sd...@utm.edu>,<sperr...@utm.edu>,<djord...@utm.edu>,<cposa...@utm.edu>,<tharr...@utm.edu>,<gfe...@utm.edu>,<cnich...@utm.edu>,<jlava...@utm.edu>,<jscho...@utm.edu>,<vo...@utm.edu>,
 delay=00:00:34, xdelay=00:00:06, mailer=relay, pri=15091061, 
relay=xmail.utm.edu. [10.51.0.154], dsn=2.0.0, stat=Sent 
(<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu> 
[InternalId=7717507] Queued mail for delivery)
Mar  3 14:41:17 mailman sendmail[24288]: v23JYu9w022801: 
to=<chaamerw2...@yahoo.com>,<jesse.kowalew...@sodexo.com>,<kevin_mclem...@hotmail.com>,<msud...@worldtrav.com>,<njanemille...@gmail.com>,<sully12...@aol.com>,<vlhi...@gmail.com>,
 delay=01:06:20, xdelay=00:00:02, mailer=relay, pri=481061, 
relay=xmail.utm.edu. [10.51.0.154], dsn=2.0.0, stat=Sent 
(<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu> 
[InternalId=7719913] Queued mail for delivery)
Mar  3 14:42:43 mailman sendmail[24288]: v23JYu9r022801: 
to=<dsimm...@utm.edu>,<emo...@utm.edu>,<eprit...@utm.edu>,<eree...@utm.edu>,<esimm...@utm.edu>,<espi...@utm.edu>,<ewhit...@utm.edu>,<ffack...@utm.edu>,<gbr...@utm.edu>,<geck...@utm.edu>,<gib...@utm.edu>,<hk...@utm.edu>,<ja...@utm.edu>,<jcl...@utm.edu>,<jdona...@utm.edu>,<jesbe...@utm.edu>,<jfors...@utm.edu>,<jgreenw...@utm.edu>,<jh...@utm.edu>,<jjone...@utm.edu>,<jla...@utm.edu>,<jlong...@utm.edu>,<jm...@utm.edu>,<jmath...@utm.edu>,<jonrm...@ut.utm.edu>,<jstre...@utm.edu>,<jyo...@utm.edu>,<kcur...@utm.edu>,<kelli...@utm.edu>,<keric...@utm.edu>,<kevan...@utm.edu>,<khe...@utm.edu>,<kprzyb...@utm.edu>,<krimf...@ut.utm.edu>,<kwill...@utm.edu>,<lda...@utm.edu>,<lea...@utm.edu>,
 [more], delay=01:07:47, xdelay=00:00:05, mailer=relay, pri=4771061, 
relay=xmail.utm.edu. [10.51.0.154], dsn=2.0.0, stat=Sent 
(<320e686fea4720449a309fc08fc6f49d01023d5...@exch2010mbox2.utm.edu> 
[InternalId=7719987] Queued mail for delivery)
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