SendIt allows you to automatically import the e-mail address of everyone who has commented on your blog or has signed up for your blog. These one-click importers can be found at Newsletter | Import Emails from Comments and Newsletter | Import Emails from WP Users.
Auto importing e-mail addresses might not be CAN-SPAM compliant. It's suggested to only use the Subscription Widget and fight the temptation to auto-subscribe these people. You can learn more about the CAN-SPAM laws
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