It will automatically mark some messages as spam, probably spam, or as having a virus attached.

I recommend it because you can set it to flag messages, but give you the final option as to whether to delete it or let it through.

With what you must be receiving with your business email addresses, this might help keep you from deleting legitimate messages to you, while allowing wholesale spam to be bounced back and deleted.

Shame that what was a fine method of personally communicating has been usurped by unscrupulous sorts so that legitimate business people can't use it effectively.

Good luck.

Marye