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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, relay=mx12.example.com.com. [123.123.123.132], dsn=5.0.0, stat=Service unavailable

Is it possible to start running debug mode for sendmail?

Diden

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The way to get more information is to contact that ISP. In theory, the address postmaster@example.com 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

1 Answer 1

Sendmail: outgoing test message in debug/verbose mode

As root you may send a test message in verbose mode. You will get full SMTP transcript.

(echo: subject: test; echo) | /usr/sbin/sendmail -v -i user@example.net

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