If you have admin portal access to write transport rules, I recommend writing a rule that has the server reply with a 550 5.7.1 Delivery Refused error. Trigger it based on the keyphrases "top of Google search" and "affordable SEO" to start with.
OP I highly recommend following these steps to create your custom filter to clear your inbox! There are also plugins that you can use to do this. It is not required but maybe less intimidating to use.
I recommend not deleting it but rather creating a label and checking the skip invoice box. That way you still have access to them if someone legitimately sent you an email that matched the query
Damn, this is helpful. I (ops manager) just manually delete these as I see them, but I don't always get to all of them in the main company inbox before the owner sees them and I sometimes have to field questions about "are you sure our SEO is good?" I'm going to set this up, lol.