SPAM Controls - content of Email

We've seen a recent uptick in SPAM emails to our Support channels.

I was wondering if anyone had any Trigger/Automation suggestions to prevent an incoming email/chat that contains certain words.

Specifically I want to:
1. NOT REPLY to the incoming email if certain word(s) are in the subject or body of the email. (so the person sending the SPAM doesn't keep trying)

2. Automatically mark it as SPAM or delete the ticket.

3. Be easy to modify later as new words need to be added

I thought about creating a ticket trigger that is at the TOP of the list (since they are processed in order) that looks for NEW tickets only that include these custom words.

Has anyone else been able to accomplish this effectively?