Ask HN: Did you get a promotional email from Basecamp?

Hi all! I had created a temporary email account with Hey, and they asked me to provide a fallback email for which I used a fake one "lameid@gmail.com".

I used this temporary email ID to send a test mail to my personal gmail account, and I was surprised to see a promotional mail from Hey coming to my personal gmail account.

Is Basecamp harvesting email addresses from the emails sent using Hey?!