Hi Brian!
Unfortunately, I cannot get my hands on the PCs of some of these clients, because we are not the ones managing their offices.
We only provide the email service (basically we just give them the connection parameters to their mailboxes and then they figure it out internally), but I noticed this issue and wanted to understand if there is a way to solve it "server side".
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)