thomasapple1 wrote:
The Mac Sequoia Mail Client selected two times a single random Email Adresses and sent the mail to this non intended cc Address. In my case it seems to have been selecting from email receivers using all email-accounts using an apple mail client phone, tablet etc connected to different email accounts. This is a severe problem concerning privacy and safety
This is the first time to hear this issue.
For problem accounts the go to way to sort things out is to delete the account(s) from the Mail.app, then add it back.
Remove email accounts in Mail on Mac
Remove email accounts in Mail on Mac - Apple Support
Add email accounts in Mail on Mac - Apple Support
Add email accounts in Mail on Mac - Apple Support
Note—
IMAP accounts stay on the server, so no local loss, when you re-sync
POP accounts download and remove from the server—therefor save your inbox/sent box if you want them
“On My Mac" is just that, local folders you created and moved mail into. So no loss
further—
To be proactive you can file a bug report / submit your Apple Feedback here: https://www.apple.com/feedback/mail.html