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by superkuh 443 days ago
Look in the thunderbird source. The devs had to make a many hundreds of lines config for each mega-corp. So, yeah, the mega-corps are covered by major workarounds in major email clients. But for normal email clients it's very hit and miss.

And while OAuth2 is open it is a toolkit for making protocols, not a protocol. And each megacorps implementation is different and handled differently.