F20 Where's my system mail?

[Arthur Dent]

> I am tearing my hair out over this. I have read previous threads on the
> subject, but most seem to relate to getting root mail. That works now
> (thanks to Suvayu Ali) - putting:
> # Person who should get root's mail
> root:		mark
> into /etc/aliases did the trick for root cron jobs.
> But I still don't get cron output for user mark.
> 
> I have MAILTO=mark at the top of my crontab file.
> 
> According to /var/log/cron the job has run and has produced output:
> Apr 14 13:58:02 Zaphod CROND[8001]: (mark) CMD (~/scripts/croncheck.sh)
> Apr 14 13:58:02 Zaphod CROND[7999]: (mark) CMDOUT (Please Note: That file does not exist)
> 
> Nothing appears in /var/spool/mail/mark though.
> 
> The exim logs show no evidence of having been bothered by cron...
> 2014-04-14 12:44:05 1WZfIy-0001xD-Mb <= fail2ban at example.com U=root P=local S=1988
> 2014-04-14 12:44:06 1WZfIy-0001xD-Mb => mark <root at Zaphod> R=procmail T=procmail
> 2014-04-14 12:44:06 1WZfIy-0001xD-Mb Completed
> 2014-04-14 13:08:35 Start queue run: pid=7745
> 2014-04-14 13:08:35 End queue run: pid=7745
> 2014-04-14 14:08:35 Start queue run: pid=8149
> 2014-04-14 14:08:35 End queue run: pid=8149
> 
> Note that the entry at 12:44 was the output from fail2ban which is
> mailed to root (and thence to Mark). I then get that email.
> 
> So where does the output from cron jobs for normal users go?

Another update:
I do have msmtp installed on this system in order to be able to mail
from php scripts. I have temporarily disabled it by moving .msmtprc out
of the way.

When I log in as another user on the system (Let's call her Mary) I can
do:
$ mail mark
Subject: Test Message
Just testing...
[CTRL-d]
EOT

and the message appears in /var/spool/mail/mark

But when I log in as Mark I get this:
$ mail mary
Subject: Testing internal messaging
Testing internal email
[CTRL-d]
EOT
[mark at Zaphod]$ send-mail: account default not found: no configuration file available

Is this significant?