Plesk: Dovecot warning ‘service auth client_limit is lower than required under max. load’

The full error from /var/log/maillog

Aug 10 17:39:06 servername dovecot: master: Warning: service auth { client_limit=1000 } is lower than required under max. load (2248) 
Aug 10 17:39:06 servername dovecot: master: Warning: service anvil { client_limit=1000 } is lower than required under max. load (2251) 

You can find your current limit with this command:

grep LimitNOFILE /lib/systemd/system/dovecot.service

For example 65535

Change the limit in dovecot:

nano /etc/dovecot/conf.d/10-custom.conf

default_client_limit = 65535

And restart Dovecot. Reloading is not enough.

systemctl restart dovecot

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