katonafull,
I have been following your dialog for some time, now. The reason being that I have exactly your same problem. Today, I was able for the first time to communicate and send my first email using the simple burglar alarm sketch that you mention. I just wanted to thank you, because I was not successful with your referenced topic either.
The only changes that have to be made to the burglar alarm sketch is to limit to one or two emails per event because as is, it sends a train of emails without holding to comply with the SMTP2GO server limits.
Thank you again.