If you are experiencing slow incoming SMTP connections to SmarterMail and the server uses a multi-core processor, we recommend changing the mode that the .NET Garbage Collector runs in to "Server mode". What this does is provide each CPU on the server, with its own object heap and garbage collection thread so, it can run the process in parallel. This should significantly speed up SMTP processing.
In order to implement this change do the following:
<loadFromRemoteSources enabled="true">< /loadFromRemoteSources>
<customErrors mode="Off">< /customErrors>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.0"/>
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