What is the meaning of opt in?

Asking to join an e-mail subscriber list.

Barry Goldsmith
3
 
|15 years ago|533 views|share |citing 
APABarry Goldsmith. (2010). opt in. Retrieved September 20, 2026, from http://smartdefine.org/opt_in/definitions/1159786
ChicagoBarry Goldsmith. 2010. "opt in" http://smartdefine.org/opt_in/definitions/1159786 (accessed September 20, 2026).
HarvardBarry Goldsmith 2010, opt in, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/opt_in/definitions/1159786>.
MLABarry Goldsmith. "opt in" 21 October 2010. Web. 20 September 2026. <http://smartdefine.org/opt_in/definitions/1159786>