Hello Xeon,
The load of my server is the following :
Processor : 50%
RAM : 281 MB of 1876
I've about 25 active mailboxes

I just made a zmcontrol status :

Host srv-mail.mwp.local
antispam Running
antivirus Running
ldap Running
logger Stopped
zmlogswatchctl is not running
mailbox Running
mta Running
snmp Running
spell Running
stats Running

But I had to stop the logger with the command : zmloggerctl stop

Is there another way to deactivate it 'definitively' ?

thanks for your help