Google has since a while started to block normal IMAP/SMTP access to gmail 
unless users specifically activate "Enable less secure apps" in their account 
settings. <>

As alternative Google now require the use of OAuth 2.0 for authentication. The 
idea is to avoid showing the real user/password to each app that wants to 
connect to the account: <>

Microsoft is also using OAuth2 with 

OAuth website: <>

Many clients are also moving towards this, like Outlook and Thunderbird.
Are there any plans support OAuth 2.0 with Courier?

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