Single opt-in

Also called: single opt-in, direct enrollment or single opt-in notification

Single opt-in is a sign-up method where someone signs up directly for a newsletter, mailing list or campaign. The user enters an e-mail address and is then immediately on the list. Thus, no additional confirmation email with a link follows.

Companies often use single opt-in because it provides few barriers. A visitor only has to perform one action. That increases the likelihood of more sign-ups. Especially in email marketing, downloads and lead generation, this can be useful.

Nevertheless, single opt-in requires extra attention, because someone can accidentally enter a wrong e-mail address. Also, another person can use an address without permission. This sometimes makes your list grow faster, but not always better.