Double Opt-In vs. Single Opt-In
A single opt-in method is one when users must take some action to subscribe. Typically, this involves filling out an opt-in form on a website. Thus, people consciously add themselves to your list. The downside of the opt-in method is that third party persons can (and they do) subscribe others to your list.
To protect people and yourself from such malicious subscriptions, setup your signup process in the way that the subscribers receive a confirmation email as soon as they were added to the list.
A confirmation email will allow them unsubscribe immediately if there was a mistake. They can unsubscribe by replying or clicking on a link within the email, for example like this one:
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Tags: email address, email addresses, email messages, subject line, subscription method, subscription request, subscriptions
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