Google Forces Developers to Stop Using PHP IMAP Extension

“Scanners and other devices - No change is required for scanners or other devices using simple mail transfer protocol (SMTP) or LSAs to send emails.”

What does that mean?

Isn’t SMTP also uses password for authentication? Or are they referring to SMTP relay which relies of Static IP?

Mostly just the author complaining that their preferred PHP module for email doesn't support Oauth.

¿Apparently, Google should wait to enforce better security until open source libraries are updated?