This is confusing, I don't understand.
It would appear that your email address or, more likely, your ISP, is blocked by Spamhaus - maybe there has been a rash of spam originating from someone using your ISP.
Check with your ISP regarding this. If emails are being blocked from reaching recipients at the far end it has nothing to do with Anti-Spam as it only filters your incoming mail.
Also try Googling "how to get off spamhaus blacklist" or similar...minus the "" of course.