[MichaelApproved]

This sounds like bad advice and would result in blocking google and other major ESPs.

I occasionally get spam from people who took the time to create gmail accounts. Based on this advice, the honey pot email address would get spam from a Gmail account and your script would block Gmail servers.

[Croak]

There exist lists of email providers. Those you can whitelist, ie. they can't get on the blacklist. Even then they would only be blocked temporarily. There also exists [e-mail] which should not filter at all. I am aware that you are able to abuse said system but if you monitor logs those issues would only be temporary.

[notpushkin]

Yeah, I mean, you can personally vet those domains/IPs?