We already invested our time in a new SmarterMail 100 support and found a critical issue for integration which was reported to the SmarterMail side. We are still waiting when the issue will be fixed and will support this version in our Preview builds.
We don't use Plesk and have written our own control panel.
So, I've asked them for some clarification. I don't see that being an issue for the majority of customers who use SmarterMail and Plesk, so I've asked them to give me some additional info on how/why that's delaying their compatibility testing.
There is an issue in their testing where they stop mailservice.exe and try spinning up a different mail server
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