We already have a ticket opened for a similar issue (started Feb 14, 2022...), but I think is from the same cause...
Actually I got this answer from Smarter Tools (and I'm waiting for the new release...):
Sent Sep 7, 2022 4:59:26 PM
The developers have a fix for this and it will be included in an upcoming release. Thank you
Gabriele Maoret - Head of SysAdmins at SERSIS
Currently manages 6 SmarterMail installations (1 in the cloud for SERSIS which provides services to a few hundred third-party email domains + 5 on-premise for customers who prefer to have their mail server in-house)