Pet peeve of the day: the #Google #gmail configuration pane to send mail through an authenticated connection to an SMTP server and conflates #TLS and #SSL in misleading ways. In this UI there are two selectors:
1) "Secured connection using SSL (recommended)"
2) "Secured connection using TLS"
What these actually mean:
1) "Secured connection using TLS"
2) "Secured connection over cleartext SMTP that is then upgraded to TLS with STARTTLS"
Nowhere does long-dead "SSL" come into play. (I just really hate it when TLS gets called "SSL", especially when here there is an option for "TLS" which means something different entirely.)

