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[Feature Request] Support for XOAUTH2 as Auth Type
It should be possible to allow XOAUTH2 as Auth Type.
During connect the server should send AUTH XOAUTH2 and accept any token in the command AUTH XOAUTH2 <xoauth2-token> sent by the client.
Spec: https://developers.google.com/workspace/gmail/imap/xoauth2-protocol#the_sasl_xoauth2_mechanism