I've always wondered how Vanguard gets away with this. They send a lot of promotional emails that all say this near the bottom of the message:
> Because you're a valued Vanguard client, we thought you'd be interested in this information. If you prefer not to receive emails of this type, simply email us. Please do not reply to this message to opt out.
> The material in this message is promotional in nature.
Interesting -- they do send a List-Unsubscribe header with an unsubscribe link that seems to work (and contains a JWT, curious), but no regular HTML link.
> Because you're a valued Vanguard client, we thought you'd be interested in this information. If you prefer not to receive emails of this type, simply email us. Please do not reply to this message to opt out.
> The material in this message is promotional in nature.
No unsubscribe link.