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Define Opt In

opt in. 1. (usually with a hyphen) Adj. Describing anything that requires a user to proactively request involvement. The term is most frequently applied to email lists or autoresponders which require a recipient to request inclusion (opt in) before receiving any messages.

There are two types of opt-in lists: single opt-in and double opt-in.

3. (without a hyphen) Noun. A person who has chosen inclusion in a list or autoresponder; an instance of soemone joining a list. For example, "Susan's list had 20 opt ins today."

2. (without a hyphen) Verb. To request inclusion, as in an email list.

See also, opt out.

 


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