A tip...
Think of a new email address (perhaps add the current year to the end of an exisitng one) and then go to the following page and set it up as another of your 15 email addresses:
https://autoreg.autoregister.net/cgi-bin/xtrmail
Then think up some suitably apologetic text that instructs human emailers how to work out that address. Don't actually include your new address in full. Then visit the following page and set it up as the auto-reply of the first address:
http://selfcare.ntlworld.com/cgi-bin/frontend
The spammers, not being real humans, will get the reply and just bin it. Hopefully, real people will twig what's going on and use the new address.