All About Email Address Validation

If you're wondering what SMTP email address validation is, why it is a bad idea, and what your options are, check out my short series on the topic:

1. SMTP Address Validation: Bad Idea. What is it? How does it work? Why do ISPs hate it?
2. Email Address Validation: Options. In this followup, I share with you some address validation do's and don'ts. How to maximize list hygiene without running afoul of spam filters.

If you've got additional resources to share on the topic, I'd love to add to them here. Please drop me a line or post it in comments.