What does Normal aggressiveness do?

When Normal aggressiveness is selected, maifloss will floss for nonexistent, available, banned, deactivated, inbox_full, illegit, invalid, bounced, and disposable email addresses. 

This is a sensible option and the one we usually recommend for most users.

Remember that there's a "help me decide" link beside the Aggressiveness options that you can click on to help you decide which mode option is the best for your contacts list.