What do you expect after a subscribing to a newsletter?

after user is subscribing to newsletter and so click the "register button" i can show a message where i alert the user that i have send an message to email... But i don't know how show this message:

1) overlay ? inside it i show the message and i alert the user that if close the overlay he goes to homepage... For me it isn't good idea overlay

2) open another page where there's the message? Ok is good but i have two problem: passa email data and time loading of page

3) when click the button the content of div (button, cta ecc ecc) is removed and i show only the new message. This is too easy but i don't know if good for UXD and i don't know if i should to remove also title (h1) of page

Thanks a lot! :)