Apple with watchOS 8.5 has fixed a security oversight in the Mail Privacy Protection feature by disabling a loophole that could actually expose your IP addresses.
New in watchOS 8.5: Mail Privacy Protection that doesn’t leak your IP addresses
Apple Mail
What is Mail Drop and how to use it on iPhone, Mac, and PC
You can easily send large attachments up to 5 GB to anyone via email using Mail Drop. It's built right into the Mail app on your Apple devices. This tutorial shows you how to send several large files, photos, videos, and documents from your iPhone, iPad, Mac, or PC with Mail Drop.
How to reset the Apple Mail app to factory settings on iPhone, iPad, and Mac
You might want to reset the Apple Mail app on your Mac, iPhone, or iPad when it doesn't update or receive new emails, or when standard troubleshooting solutions don't fix the issue. Resetting the Mail app from scratch is almost equivalent to uninstalling and reinstalling it. If you wish to have a fresh start with the Mail app, here's how to erase everything in it. After that, you can set it up again.
iOS 15’s privacy protection feature in Apple Mail doesn’t extend to Apple Watch
A new privacy protection feature in Apple Mail that launched alongside iOS 15 and iPadOS 15 isn't actually supported when using the company's Mail app on Apple Watch.
Apple’s new Hide My Email and custom email domain features are now live at iCloud.com
Apple's Hide My Mail feature along with the ability to use custom email domain with iCloud Mail are now both available, ready to be configured via the iCloud.com website.