The tag line is ... ironic.
I notice that the return address emails are different between the two companies;
Vanity Fair: firstname.lastname@example.org
So it looks like Vanity Fair uses a third party email service provider, where Epicurious is sending spam from their own domain. Third party ESPs are usually a little more strict about the behavior of their clients, so
Wait, maybe not. Is this email from Vanity Fair, or is it from Epicurious? It seems a little suspicious. Thank you, Conde Nast for sending me spam from Vanity Fair on behalf of Epicurious!
I got an austere screen when I clicked on the button.
Here are the email headers from the above email. I know Conde Nast must be feeling a little heat, because these articles are starting to get some traction, and I'm receiving email from readers angry about Epicurious. We'll see if Vanity Fair gets my ire.
Update 1/24/2016: looks like the unsubscribe took. Now if I could just unsubscribe from their sister company, that would be a real victory.