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Entry  Tue Nov 21 17:51:01 2017, Koji, Configuration, Computers, nodus post OS migration admin 
    Reply  Tue Nov 21 23:47:51 2017, gautam, Configuration, Computers, nodus post OS migration admin 
       Reply  Wed Nov 22 11:51:38 2017, gautam, Configuration, Computers, nodus post OS migration admin 
          Reply  Sun Dec 3 05:25:59 2017, gautam, Configuration, Computers, sendmail installed on nodus  
             Reply  Sun Dec 3 17:01:08 2017, Koji, Configuration, Computers, sendmail installed on nodus  
             Reply  Fri Jan 12 12:31:04 2018, gautam, Configuration, Computers, sendmail troubles on nodus  
                Reply  Fri Jan 12 16:01:27 2018, Koji, Configuration, Computers, sendmail troubles on nodus  
                   Reply  Fri Jan 12 18:22:09 2018, gautam, Configuration, Computers, sendmail troubles on nodus  
                      Reply  Sat Jan 13 02:36:51 2018, rana, Configuration, Computers, sendmail troubles on nodus  
                         Reply  Sat Jan 13 03:20:55 2018, Koji, Configuration, Computers, sendmail troubles on nodus  
Message ID: 13539     Entry time: Fri Jan 12 12:31:04 2018     In reply to: 13461     Reply to this: 13540
Author: gautam 
Type: Configuration 
Category: Computers 
Subject: sendmail troubles on nodus  

I'm having trouble getting the sendmail service going on nodus since the Christmas day power failure - for some reason, it seems like the mail server that sendmail uses to send out emails on nodus (mx1.caltech.iphmx.com, IP=68.232.148.132) is on a blacklist! Not sure how exactly to go about remedying this.

Running sudo systemctl status sendmail.service -l also shows a bunch of suspicious lines:

Jan 12 10:15:27 nodus.ligo.caltech.edu sendmail[6958]: STARTTLS=client, relay=cluster6a.us.messagelabs.com., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-GCM-SHA384, bits=256/256
Jan 12 10:15:45 nodus.ligo.caltech.edu sendmail[6958]: w0A7QThE032091: to=<umakant.rapol@iiserpune.ac.in>, ctladdr=<controls@nodus.ligo.caltech.edu> (1001/1001), delay=2+10:49:16, xdelay=00:00:39, mailer=esmtp, pri=5432408, relay=cluster6a.us.messagelabs.com. [216.82.251.230], dsn=4.0.0, stat=Deferred: 421 Service Temporarily Unavailable
Jan 12 11:15:23 nodus.ligo.caltech.edu sendmail[10334]: STARTTLS=client, relay=cluster6a.us.messagelabs.com., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-GCM-SHA384, bits=256/256
Jan 12 11:15:31 nodus.ligo.caltech.edu sendmail[10334]: w0A7QThE032091: to=<umakant.rapol@iiserpune.ac.in>, ctladdr=<controls@nodus.ligo.caltech.edu> (1001/1001), delay=2+11:49:02, xdelay=00:00:27, mailer=esmtp, pri=5522408, relay=cluster6a.us.messagelabs.com. [216.82.251.230], dsn=4.0.0, stat=Deferred: 421 Service Temporarily Unavailable
Jan 12 12:15:25 nodus.ligo.caltech.edu sendmail[13747]: STARTTLS=client, relay=cluster6a.us.messagelabs.com., version=TLSv1/SSLv3, verify=FAIL, cipher=DHE-RSA-AES256-GCM-SHA384, bits=256/256
Jan 12 12:15:42 nodus.ligo.caltech.edu sendmail[13747]: w0A7QThE032091: to=<umakant.rapol@iiserpune.ac.in>, ctladdr=<controls@nodus.ligo.caltech.edu> (1001/1001), delay=2+12:49:13, xdelay=00:00:33, mailer=esmtp, pri=5612408, relay=cluster6a.us.messagelabs.com. [216.82.251.230], dsn=4.0.0, stat=Deferred: 421 Service Temporarily Unavailable
 

Why is nodus attempting to email umakant.rapol@iiserpune.ac.in?

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