Postmaster settings haven't changed, I checked it. Next time I started the gateway everything was correct (no errors). Which email address this error complains about? Maybe gateway received incorrectly formed email address?
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...