What a bummer. It really looks like you can’t send a single email through elastic email without an unsubscribe link at the bottom. (In my case, they’re also adding my address. But I haven’t investigated whether the address can be removed).
In any case, I think this should disqualify elastic email as an officially recommended email provider for discourse. It’s unusable like that. And 30 minute install wont work if you have to go back and reconfigure your email…