Oh! In that case... yes, users do often enter their email addresses incorrectly into forms. Others, for whatever reason, will trust you with their credit cards, but not with their email addresses. Odd, but it happens.

If you're doing e-commerce, you want to ensure that you can, in fact, contact the customer if there's a problem with the order (or payment for it). If you're running a mailing list, especially if it's a large one (as promotional lists often are), it's just good practice to minimize bounces. Some mail system administrators get grumpy if you fling too many invalid addresses at their servers -- who could blame them? It's sometimes hard to tell innocent errors from dictionary-attack spamming or joe-jobbing.

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