Issue cannot get sender domain

mw004

New Pleskian
OS : ‪Ubuntu 18.04.3 LTS‬
Product : Plesk Onyx Version 17.8.11 Update #66

After checking in /var/log/maillog I see the following errors.

server....:cannot get sender domain
server...: Unable to intialize check-quota mail handler
server3: Error during 'check-quota' handler

Do you have any idea how to fix this problem?
 
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