After I entered my email address a message and hyperlink appeared.
"Looks like you've opted out of email communication. Click here to get an email and opt back in."
This is great. This serves business needs and user needs without being obstructive.
I wonder if they discussed just placing a checkbox there to have the user opt back in.
Why did they choose to go with a link that triggers an email?
Anytime you leave the burden on the user you risk missing the goal.
Nevertheless, nice work!