Pls check if the mailbox that you are trying to send the mail from is not marked as Postmaster? You can do that in Email and Conferences >> Settings >> Mail and Conference Settings >> Postmaster field
I would like to know what BackgroundHALShouldPause does, and how to use it. While it's listed in the HAL Primitives report, it is not used in source code and it doesn't appear in the LMS HAL...