Cronjob keep making email requests


New Member
Oct 12, 2019
Hello forum

Excuse me for my poor English since it's not my primary language.

So I've been working with PVE 6 on my home server; Dell PowerEdge R710.

And since I wanted it to stay quieter, I made a custom script to control fan speed.

To monitor CPU temperature every 10 second, I registered my script in crontab.

It worked find but after about 3 days, I have noticed that /var/log directory was getting really big(about 13GB)

Apon research, I found that same log was being generated every second.

Like this below:
Oct 13 00:05:20 prox1 postfix/local[12713]: 5873CC7694: to=<root@prox1>, relay=local, delay=253236, delays=250813/2422/0/0.63, dsn=2.0.0, status=sent (delivered to command: /usr/bin/pvemailforward)
Oct 13 00:05:20 prox1 postfix/qmgr[1825]: 5873CC7694: removed
Oct 13 00:05:20 prox1 postfix/qmgr[1825]: 1DC85C2069: from=<>, size=2935, nrcpt=1 (queue active)
Oct 13 00:05:20 prox1 postfix/qmgr[1825]: 78447C1F8C: removed
Oct 13 00:05:20 prox1 postfix/cleanup[13584]: 2D82FC0BBA: message-id=<20191012150520.2D82FC0BBA@prox1>

It is just a part of a huge log but rest of the log contains pretty much the same thing.

After some more research, I found that it was crontab that was keep sending email.

So I edited my crontab like below:
* * * * * /bin/sh /root/tempControl/ >/dev/null 2/&1
* * * * * ( sleep 10 ; /bin/sh /root/tempControl/ >/dev/null 2/&1 )
* * * * * ( sleep 20 ; /bin/sh /root/tempControl/ >/dev/null 2/&1 )
* * * * * ( sleep 30 ; /bin/sh /root/tempControl/ >/dev/null 2/&1 )
* * * * * ( sleep 40 ; /bin/sh /root/tempControl/ >/dev/null 2/&1 )
* * * * * ( sleep 50 ; /bin/sh /root/tempControl/ >/dev/null 2/&1 )
to ignore output and error data

but still I'm getting the same log as above and log files like, mail.warn under /var/log are growing about 1MB per 30 second.

Is there any way to mitigate this issue or to disable email service on proxmox? since I don't need it.

Thank you

add at the end of the crontab line ' MAILTO=““ ' to deactivate the mail notification.
Or you can use systemd-timer instead.
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