Text notices stopped (via email to tmomail.net) working for me about a month ago. Just getting around to investigating. ;)
Had been using default SMTP settings, so thought entering them might work, but no. I get "Mail server failure - Password not accepted". I've typed and retyped it very carefully, and tried ctrl-v. I changed my pw on gmail just to be sure I have the right one.
Test message to isyalerts@gmail.com didn't work, either.