Add Oauth2 providers for Yandex and Mail.ru

[henrypp]

Checklist

• [X] I have used the search function to see if someone else has already submitted the same feature request.
• [X] I will describe the problem with as much detail as possible.
• [X] This issue only contains a request for one single feature, not multiple (related) features.

App version

6.306

Problem you are trying to solve

There is a requirement for Oauth2 authorization for Yandex and Mail.ru accounts, as in Thunderbird, but here this is still not available feature.

Suggested solution

Mail.ru:

Documentation: https://oauth.mail.ru/docs Authorization endpoint: https://oauth.mail.ru/login Token endpoint: https://oauth.mail.ru/token

Yandex:

Documentation: https://yandex.com/dev/id/doc/dg/imap/index.html Authorization endpoint: https://oauth.yandex.com/authorize Token endpoint: https://oauth.yandex.com/token

Screenshots / Drawings / Technical details

No response

[henrypp]

I cannot do it myself because i need to provide client id's. It's only on you.

[henrypp]

@cketti what about this you can say?

[cketti]

Now is a bad time to add support for Russian email providers. Your best bet might be #6152.

[henrypp]

Why it is a bad time?

[Hasshu]

@cketti If I may ask, do you guys risk facing some legal repercussions, or is it about personal convictions only?