I got a 2nd "A note before you go" email from you, so I replied. It bounced back.
Your message to catchall@appsumo.com has been blocked. See technical details below for more information. The user or domain that you are sending to (or from) has a policy that prohibited the mail that you sent. Please contact your domain administrator for further details."
Looks like your Google Workspace email is misconfigured. There was nothing "spammy" about my reply email (it was actually nice), but if it WAS spammy, there shouldn't be a reply.
Kind of makes me wonder if I was using TidyCal, would I be able to reach you if I needed technical assistance?