Another important note is that Spotlight may be disabled for this folder. If so, you may want to turn it on so you can find which particular message you want to delete.
This thread has been closed by the system or the community team.
You may vote for any posts you find helpful, or search the Community for additional answers.
How to delete mail messages securely?
Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.