English
wikipedia|Opt-in_e-mail_advertising
Adjective
opt-in
#Of a selection, the property of having to choose explicitly to join or permit something; a decision having the default option being exclusion or avoidance; used particularly with regard to mailing lists and advertisement.
#:They set up an opt-in mailing list, so that those who wanted the notices could subscribe.
See also
opt-out
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