OAUTH2.0 GMAIL

[Martin Obongita]

Hi all,
Has anyone managed to setup smtpsend sample library with OAUTH2.0 with a gmail server?
Question 1: When is it necessary to use Oauth with Gmail?Question 2: Which is the best sample libraries HTTP, IMAP, POP and SMTP to work with gmail?Question 3: Is there a way to setup a complete emailing utility with Omnis so that I can have sent items, incoming emails? Where can I get such a sample library? Or instead, it's just best to store emails in the database and mark them as either sent or pending?
Any useful leads will be apprieciated.
Kind regards,Martin Obongita.