As you probably know I'm a trusting sort (NOT), so I probably wouldn't trust them with my data (email address, etc.) even though it is opswat.
So I use a paid option that pulls down a small portion of the email (form my email servers) and analyses them, generally for spam. But I also keep an eye out for suspect email and look at the headers, etc. and flag for deletion off the email servers.
Once done it calls my email client and I download the remaining emails.