I run the munin monitoring application on my debian Wheezy server and I would like to test the alert-email-notification procedure. To do that, I add in munin.conf the following line:

df._home.warning 25

I set 25 because the df command returns 30 for /home.

I also defined one contact:

contacts me
contact.me.command mail "munin test ${var:host}" my_email@my_isp.com

Unfortunately I don't receive any mails.

There are no errors in the logs. Note that I use exim4 to send emails and that I can send emails from a terminal.

What could be wrong in my configuration ?

Note also I ckecked manually the df plugin:

munin-run df

returns 30 for /home

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