Lots of last minute changes during live productions testing.
SMTP does not seem to work under some configurations.
IMAP throws NoResponseError under some configurations (caught as "failed to login")
Threading code seems to break down ability to interact with database and load modules. All module loading occurs outside of thread now.
In production code was executed at the Model level using Service#check_all_loop running from the console.
Rake task seems to break down when using threads.
Database pool size seems to limit threading operations.