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There are conflicting reports on the benefits of using the double opt-in method for subscribers. Some email specialists insist on making double opt-in mandatory for every email list they manage. On the other hand, some specialists claim that it takes too much effort for subscribers to click on the link within the confirmation email and the drop off is too high to ignore.

The truth of the matter is double opt-in lists are much more valuable than regular ol’ opt-in lists. If you do plan on going this route, make sure the time between the user’s initial opt-in and the opt-in confirmation is long enough for the user to react. The standard length of time is usually 30 days. Most people check their email once every 30 days, so you should be set. Another advantage to utilizing double opt-in methods is the likelihood that someone confirms false emails is very doubtful. You’ll also lower the chance that From Address / IP will be marked as SPAM. Think about it… if your subscribers will go through the effort of double opting-in for your email, there’s no way they’ll mark it as SPAM.

If you're simply looking for volume for your email list, double opt-in is not entirely necessary. But if you want the strongest, most valuable list you can gather - with a higher chance of a good ROI - there is no doubt in my mind double opt-in is the way to go.