Gmail does not require OAuth

Originally created by @cbrownstein on #16734 (Redmine)

https://tails.boum.org/doc/anonymous_internet/thunderbird/index.en.html

On that page it is stated that “It is impossible to connect to email providers that require the OAuth authentication mechanism such as GMail or Mail.ru”

However, Gmail does not require OAuth authentication and I can confirm it is possible to access Gmail with Thunderbird in Tails.

See: https://support.google.com/accounts/answer/185833?hl=en

I do not know if Mail.ru actually requires OAuth.

I propose removing Gmail as an example.

Related issues

• Blocks #15941 (closed)