Does mac mail delete what it thinks is junk

Yes, macOS Mail app does have a built-in feature to automatically delete emails that it thinks are junk or spam. This feature is called "Junk Mail Filtering" and it's enabled by default.

When Junk Mail Filtering is enabled, Mail app uses various algorithms and machine learning techniques to analyze incoming emails and identify those that are likely to be spam or junk. If an email is deemed to be junk, it will be moved to the "Junk" mailbox and may also be deleted after a certain period of time.

Here's how you can check if Junk Mail Filtering is enabled and adjust its settings:

1. Open the Mail app on your Mac.
2. Click on "Mail" in the top menu bar and select "Preferences".
3. Click on the "General" tab.
4. Look for the "Junk Mail" section.
5. Check if the "Enable junk mail filtering" checkbox is selected. If it's not, select it to enable the feature.
6. You can also adjust the "Junk Mail Filtering" settings by clicking on the "Edit" button next to it. This will open a new window where you can customize the settings, such as setting the threshold for what constitutes junk mail.

It's worth noting that while Junk Mail Filtering can be effective, it's not foolproof and may occasionally misclassify legitimate emails as junk. If you find that legitimate emails are being deleted, you can try adjusting the settings or turning off the feature altogether.