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1. Prevents erroneous subscriptions. Often, simple misspellings of common user names or domain names may cause email messages to begin sending to a completely unintended address. Not only do you lose an interested subscriber, but you gain a user that will most likely cry foul and complain of spam.
2. Prevents malicious subscriptions. A popular nuisance tactic in the internet age is to subscribe someone who really ticked you off to as many mailing lists as possible, sending them a mountain of email. This creates a terrible headache for the victim and turns your newsletters into tools of harassment.
3. Provides an audit trail. Having double opt-in confirmation logs allows you to refute any spam complaints that may come up. Double opt-in is seen by mail administrators as the most privacy conscious way of handling the subscriptions; in case of any corporate filtering, they will be more apt to whitelist your newsletters if confirmation logs are available. And last, but certainly not least, confirmation logs protect against anti-spam legislation by providing evidence of solicitation.
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