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=== How do I use the 'mail' command? ===
You're on a linux server and you see "You've got mail". So, you type 'mail' and immediately have no idea how to process the messages. See this excellent tutorial/write-up of the basic '''mail''' command: http://www.johnkerl.org/doc/mail-how-to.html The <code>mail</code> command works like the editor '''<code>ed</code>''' which is to say not very well known today. (See <code>man mail</code> -- The manual page was written in 1993.) The man page refers to [https://docs.freebsd.org/44doc/usd/07.mail/paper.pdf The Mail Reference Manual] originally written by Kurt Shoens
=== What is my mail server doing? ===
<code>mailq</code> tells you about what's in the queue (What it's going to send).
Grepping the mail log can tell you where your server has sent mail.
<source lang="bash">
grep --perl-regex --only-matching ' to=[^ ,]*' /var/log/maillog | awk -F= '{print $2}' | sort | uniq -c
</source>
<pre>
37 admin@equality-tech.com\t
305 meza-ansible
305 <meza-ansible@my.qualitybox.us>
35 root
</pre>
== Tools ==
