***
For the reasons oldman stated, I have both of those providers active even though I also use web based email only. If you search the forum, you will find that there have been those that were alerted my the email provider that unknown email was being sent from there computers. Otherwise, you may only find out when your ISP tells you that you are sending out too much email, that you may be a spammer, and that you may loose the use of your connection through them. After all, they use very little resources.
***