OK, forget my previous answer; I managed to send an e-mail via the Gmail SMTP server following these steps:
- I turned on 2-factor authentication for my Gmail account (https://myaccount.google.com/security)
- I added an app password (https://myaccount.google.com/apppasswords)
- I configured the Email Connector in Mendix using the app password (see screenshot below)
- I send a test e-mail filling in: Subject, From, To and a body
Hopefully this also works for you!
I think you should set Use TLS to True.
Do you use two-factor authentication for your Gmail-account? In that case, you might need an app password as well, not sure how that works. You can read more about that here.
Hopefully this helps!
Regards, Johan