double opt-in
noun[CorU]
E-COMMERCE,MARKETINGukusaprocessforprovingthat youwantyournameaddedto anemaillistin which youreplyto anemailmessagegivingpermissionto beadded:
Thedoubleopt-inmethodmayproducesmallerlists, but it stillbringsinhighersalescomparedto alargerlistbuiltbysingleopt-ins.
Compare
single opt-in