Computer Help and Support

For email, you can simply email it to yourself and bcc it to everyone else. That way the other recipients are invisible. That's the short answer to your first answer. More complicated things involve your email program, but rhis should be enough to thwart your random bomber.

If you are using Windows, 10 and 11 have excellent built in security. Unless you are a business or government user, you don't need supersecurity applications. Most of the time.

I'm going through the same thing with my church, and there's always one or two who just don't get it, so everthing has to be done on "our" side. What I said so far has been working so far.