Do you know the difference between a double or single opt-in and an implicit opt-in? The question is answered in this primer on opt-in email marketing.

My last Email Insider column ("Email Industry Disagreements: Where Do You Stand?") touched off the start of some good debate over single vs. double opt-in (also called confirmed opt-in) that went ...

When you visit a website, you’ll often see a pop-up window presenting the option to enter your email address to receive a discount or free shipping. After entering your email address, you can take ...