[ohyeshedid]

From that site: https://i.imgur.com/tHTSKXL.png

Check the bottom. When you clickthrough the Email preferences link, you're presented with a list of several email lists you can subscribe/unsubscribe from.

Edit: I was subscribed to a couple lists I never directly opted-in to receive, though I never received any emails from those lists.

[bad_user]

Ah, the problem is that I don't have that option — must be a regional thing:

https://imgur.com/a/BR1ILDe

[ohyeshedid]

Just happened to catch this, thanks for the response. That's interesting that it's possibly regional, and I'm unsure why. They weren't sales emails, it was just newsletters about various Mozilla bits.