Here's my update: after reading all of the posts here and on the
budget board, I got a little impatient this morning.

I went back in used my friend's name and email and sent myself the postcard. (actually used the video with kids, but I don't think it matters) Less than an hour later, I had the email.
The sender was "send a little sunshine" and the subject was "XX wants to invite you to Florida". Once you get the email, open it and click the link. It will take you to the website to sign up for the SW code.
As for the first 3 emails I sent....none of those emails addresses have received anything.