iMac Sonoma, MAIL program corrupted - can it be deleted and newly installed?

Please tell us which Mac, model and year you’re having trouble with, and what macOS version you’re running. Find that info by clicking the Apple menu () at the top-left of your screen and then select About This Mac.

(Note- for privacy and security please never post your serial number.)

The Mail app cannot be deleted, but it can be reinstalled. Reinstalling the Mail app is done by reinstalling macOS.

To non-destructively reinstall macOS as a troubleshooting measure - without deleting user files, documents, pics and vids, etc. – startup your Mac in Recovery mode by restarting and when you hear the startup chime press the Command-R (⌘R) keys until you see the Apple logo and progress bar. Best to use a wired USB keyboard for this.

Follow the onscreen instructions to “Reinstall macOS…”.

How to reinstall macOS - Apple Support

NOTE– You should not have to delete, erase, format, partition or otherwise alter your startup disk for this. If that becomes an option, quit the process and restart your Mac. Then come back here for additional advice.

FOLLOW UP -

Before you resort to reinstalling macOS, you should try booting to Safe mode and see if that has any effect on the issue. It can take much longer to safe boot (5 min) so be patient.

How to use safe mode on your Mac - Apple Support 

Safe mode very often corrects weird software behavior by forcing the OS to do cache clearing and other housekeeping. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's expected.

Does the problem persist while in Safe mode?

Often not required, but consider allowing the Mac to "soak" in Safe mode for an hour to allow maintenance routines and processes time to complete, then exit safe mode by restarting your Mac normally and re-evaluate the issue again.

Have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?