A new updated mysqlclient18-compat package is now available for download from our mysqlmeta repository.
This update addressed the issue with the previous release of the mysqlclient18-compat-10.2.36-3 which can cause mail service to stop after Plesk update.
mysqlclient18-compat-10.2.36-4
yum update mysqlclient18-compat --enablerepo=mysqclient