Directory Critic

Optin Bulk Email List
Reputable email marketing vendors don't let you use purchased lists.

If you're using email marketing software now or plan to in the future, you'll find that reputable companies will insist that you use opt-in email lists. You might be saying, "I'll just use a non-reputable email marketing vendor.
" Wrong again. Using ESPs that don't require their customers to use opt-in email lists suffer poor deliverability if they're using a shared IP address.