Opt-in or Double Opt-in?

The most difficult step in setting up the sign-up form is deciding the type of opt-in method. The preferred option is to use Double Opt-in method (also known as Confirmed Opt-in method). In this method, the system will send a confirmation request to the subscriber when he / she sign-up on the web site; the email address will be activated only when the subscriber clicks on the confirmation request. If the request email lands in the junk email folder or the subscriber does not confirm the subscription, the email address will not get activated. The major advantage of using this method is that no one can subscribe using someone else�s email address and you less likely to get any complaints.

In the Single Opt-in method, once the user submits an email address via the sign-up form, it will be added to the List and activated immediately.