Mac Mail on M1 Macbook Pro won't start in Monterey

Wow, thanks for the supersonic reply Dialabrain!

I'm a wee bit nervous about doing that given the huge list of virus and malware captures Intego keeps boasting to me about. If you, or anybody, can suggest an alternate to Intego for virus and malware protection, and especially for blocking spam (as Apple's controls don't seem to do anything at all to block repeat spam senders) I'd be forever grateful and happier about deleting it.

Thanks. I've just buckled up and uninstalled Intego. I do feel a little "freer". We'll see how that goes.

I find that blocking regular spammers in Apple Mail doesn't do anything to block them - which is a huge pain as I publish quite a lot and seem to attract at least a dozen spam messages each day, often more, from recurring sources you'd think would be easy to identify and block.

Your reassurance and redirects re the safety of Mac has been the highlight of my week. Sad we get so easily drawn in by fear campaigns. Knowledge helps!

Thanks again. That's reassuring. Booting in safe mode does seem to effect a temporary cure. I'll follow through on your suggestions. Many thanks.