Both my husband I received emails to sign up. I clicked on both and are they are tied to a particular card - the confirmation I received says:
For your account ending in: xxxx
Thank you, (Name)
You've enrolled successfully.
Visit southwest.com today!
Earn 4 points for every $1 spent directly on Southwest Airlines® purchases between April 15 – July 15, 2015to footnote1,to footnote2 and enjoy your next reward sooner!
I'm thinking that all of you that clicked on this link are getting a different promo because the page we received after clicking on the "enroll" button was clearly for us...our account number and name.