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NOTE: This suggestion is for JIRA Cloud. Using JIRA Server? See the corresponding suggestion.
It would be great if JIRA can support OAuth authentication for IMAP as described on this https://developers.google.com/gmail/xoauth2_protocol
3-legged OAuth Authentication for IMAP support
Support for IMAP/POP OAuth 2.0 token based auth
Improve Jira Service Desk Desk Security Standard to integrate with OAuth when configuring Mail Handler
Add support for Office 365 Modern Authentication in Jira