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I am getting alot of the following messages from an ISP when sending out emails. Is there any way to get more information from these ? Users are reporting that they are not receiving any emails?

Jul 5 17:02:50 smtp sendmail[11239]: r6592of7011232: to=, delay=00:00:00, xdelay=00:00:00, mailer=esmtp, pri=168781, [], dsn=5.0.0, stat=Service unavailable

Is it possible to start running debug mode for sendmail?


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The way to get more information is to contact that ISP. In theory, the address should get an email to the person in charge of email systems, but there's the problem of theory and practice again... – Jenny D Jul 5 '13 at 9:12

Sendmail: Sending outgoing test message in verbose/debug mode

As root you may send a test message in verbose mode.
You should get full transcript of SMTP session to the remote SMTP server.

(echo: subject: test; echo) | /usr/sbin/sendmail -v -Am -i

You may add additional debug/tracking command line options:
-d8.20 - tracking DNS queuries
-d60.5 - tracking maps (databases) queries

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I have the same problem and running in verbose mode did not help debug the issue further. The verbose logs actually indicated that the mail was sent. maillog mentions otherwise (stat: Service unavailable) – Vivek Kodira Oct 8 '14 at 7:29
@VivekKodira Have you used -Am command line option? [I have added it to the answer] – Andrzej A. Filip Oct 8 '14 at 7:51
@Andrej Thank you. Worked with the -Am option and gave a useful response. – Vivek Kodira Oct 8 '14 at 8:23
@AndrzejA.Filip Thanks, this really helped me solve this issue! – Digital Human Nov 18 '15 at 14:17

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