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ecbrenner commented on the word double opt-in
A type of e-mail subscription sign-up process:
1. Person indicates his desire to sign up for an e-mail subscription on a site.
2. The site sends a confirmation e-mail to the subscriber.
3. The subscriber must respond as directed in the e-mail for the subscription to be valid.
If the subscriber does not respond to the confirmation e-mail, the subscription is canceled. This sign-up process is considered by e-mail marketing experts to be the best process to ensure only people who really want to be on a list are added to it.
January 28, 2009