Any requests to join a List are emailed a Confirmation Message. The Subject line contains a random number that our computer generates each time.
See these detailed instructions on how to invite Subscribers and start the opt-in process.
When the Subscriber replies (or clicks a link inside the email body), our server matches up the random number, adds them to your List, and sends your Welcome Message.
See these detailed instructions on changing the Welcome Message.
This prevents pranksters and viruses from getting other people signed up to your List.