Try using Anti SPAM ware instead. GFI is good or there is also hardware solution that block out keywords. This is better then banned mail address or IP Address. SPAMMER will use spoofed Mail or ISP Assigned DHCP IP address to spam you.
Most of them now uses Local SMTP engine without having to hop through ISP. therefore any RDNS will return a non MX record. Keyword is still one of the most effective ways.
I know no voice, I knew not systems,
i know NUTS on networking, Therefore I dont know anything!
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