I don't think this soft is in the official repositories. Seems a little funky (maybe
it isn't funky).
The changelog entry for version 2.200 mentions a recent change that's possibly related to what you're
referring to:
Enhancement: Append a final email report on each account at the end of
the synchronization. Use --noemailreport1 and --noemailreport2 to avoid
final emails reports in each INBOX.