Cannot get Gmail to work with SMTP for notifiers. I have not tried any other email services.
I've tried the settings listed here:
https://community.helpsystems.com/forums/intermapper/notifiers/958c81ce-fa83-e511-80d0-005056842064
And the non-SSL settings using aspmx.l.google.com, port 25 sending only to another gmail account.
https://support.google.com/a/answer/176600?hl=en