Send e-mails with GMail
To send e-mails with GMail, you have to use this configuration:
SMTP server: smtp.gmail.com
Connection: Full SSL
[x] Perform SMTP Authentication
POP3 is not required
If you use 2-Step-Verification in GMail, then you have to use an App Password. That means that you have to enter an App Password into WebSite-Watcher instead of your regular GMail password.
More information about app passwords can be found at https://support.google.com/accounts/answer/185833