We use the double opt-in feature a lot, for our customer's maiking lists.
Here's an example of a link: www.lakesregionhistory.org/subscribe.asp
Enter your e-mail address, and you'll receive a confirmation e-mail messages, with a link on which you must click, to be added to the list.
Bruce Barnes
ChicagoNetTech Inc
brucecnt@comcast.net
Phonr: (773) 491-9019
Phone: (224) 444-0169
E-Mail and DNS Security Specialist
Network Security Specialist
Customer Service Portal: https://portal.chicagonettech.com
Website: https://www.ChicagoNetTech.com
Security Blog: http://networkbastion.blogspot.com/
Web and E-Mail Hosting, E-Mail Security and Consulting