Cron e-mails me every 5 minutes. [Solved]

[tabanus]

I recently setup a cron job to synchronise some directories every 5 minutes. For some reason the system sends me an email each time it completes.

I know I must have set it up to do this many years ago for something long since forgotten, but I've no clue what I did to enable this, and now my e-mail inbox is filling up with me spamming myself.

I don't have sendmail installed. For now I've setup a filter in Thunderbird to deal with it, but I'd rather stop the spam. The file /var/log/mail.log only confirms that the mail was sent.

So, any ideas on how to stop this? Thanks.
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Things you might say if you never took Physics: "I'm overweight even though I don't overeat." - Neil deGrasse Tyson

[mike155]

You probably receive e-mails, because your cron job writes something to STDOUT or STDERR.

Redirect output to STDOUT and STDERR to /dev/null and the spam will stop.

You can redirect output either in the script you wrote or in your crontab entry. If you choose the latter method, your cron entry should look like the example below:

[szatox]

Tabanus, this is a very standard cron behaviour. If it finds some program* it can use to send emails AND your task prints some output, it will attempt to send an email to its owner.
You don't explicitly configure it, this is the sane default. You run some task, this task prints some output. Isn't it obvious, that you want to see that output?
You get an email, so you know your task was triggered and you can check the result. What's not to love?

[Fitzcarraldo]

Have you tried editing /etc/crontab and adding the following at the beginning?

[tabanus]