Next, I proceeded to delete my account. The emails didn't stop.
I raised concern on Twitter. Their support staff assured me the emails would stop. They didn't.
I keep marking their emails as SPAM in Gmail but Gmail doesn't seem to learn the behaviour.
I could create a filter and automatically send their emails to spam but that feels like a personal defeat.
HN: What would you do?
IP block on their SMTP sender endpoint. But then I host my own email myself, so I can do such things with ease.