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The system is 2019 27 iMac Operating system is macOS Monterey 12.0.1 Mac Mail version 15.0 I have two email accounts set up on from gmail and on from iCloud. The gmail account works fine it's only the iCloud account that is having issues. to date I have tried rebuilding the mailbox. going into ~/library/Mail/V9/MailData/ moving Envelope Index ExternalUpdates.storedata to my desktop and deleting any other files with same name than restarting mail.  these have no affect the body of the messages will not display I have noticed that opening activity and connection doctor mail is constantly connecting to iCloud nonstop [https://drive.google.com/file/d/14_OQk3WHuOwI6hig2Bb2hSro3Urg7kdA/view?usp=sharing)