I have a monthly newsletter. In my subscribe form I use a double opt-in method:
- The visitor subscribes.
- I send him a confirmation email.
- If I receive a reply, I add him/her to my system.
In the event I do not receive a reply, how long can I store his/her email address? Are there any legal requirements related to that?
I am from the US and I am also interested in the policies of European countries.