Kima - That's an absolutely astonishing ammt of spam to be receiving. I hope those 9972 messages are the total spam traffic to all users on an email server (ie, many different adrs). Hopefully, 9972 is not the spam count to just your own (single) personal or business email adr.
If it is, my guess is that adr has appeared on some web site, and the email address harvesting 'bots have (of course) found it. Several years ago, my old company innocently had my name and email adr up in lights on various of their web pages, and that address became swamped with spam within a few weeks.
Rather than openly posting your contact info, have customers fill out a web-based email-like form to initially contact you. The 'bots can't harvest your email adr from such a form. When we went to this approach (and I set up a new email address for myself), spam on the new acct never got to be more than a few per day.
As others have already suggested, I strongly agree that switching over to a new email adr is the real solution (NOT better countermeasures). I don't want to press you for details, but I am having a very difficult time imagining why you can't do this.
In the case of my old company, we turned on an auto-reply feature which replied to every incoming email (spam and real) with an explanation of the problem and the URL of the "contact-me" web form. We left this running for 6 months to make sure all real customers were informed of the change, and then shut it down. Many people didn't like using the web based contact form, but since they only had to use it once to initially contact us (we always responded by normal email), it was no great inconvenience.
If, for some reason, the auto-reply route and the web based email contact form are not acceptable in your situation, then put up a new email contact address for yourself on each of the web pages where it needs to be appear, but do so in mangled form, e.g., "KIMAS-NEW-EMAIL-ADR deletethis AT KIMASNEWDOMAINNAME deletethis DOT ORG". This won't be harvested, and you can migrate everyone over to this new semi-private adr just like as you would have done using the web based response form.
Can you do either of the above?
Tom / PM