We have new version of Mail Server.
It targets .NET 4.5 or later.
We had to switch the platform to support TLS protocols 1.1. and 1.2.
New version can be downloaded from
If you downloaded 1.0.9.0, which was released yesterday, please download 1.0.9.01, because yesterday's version has an issue with secure only ports (995,993,465).
Thanks