A lot of messages like the following:
check-quota filter[XXXXX]: Some args not defined. Use /opt/psa/handlers/hooks/check-quota <CONTEXT> <FROM> <TO>.
The message is just a warning, which may be caused by a problem with some mail handler.
Ignore this message or try to recreate mail handlers as per instructions in this article: #213918045 - How to recreate mail handlers in Parallels Plesk Panel 10.4 and above.