> > No. Consider the fine example of an IP which is not one of yours sending > > you mail claiming it is a host in your domain. Like - some random korean IP
> > connects to you and says "HELO perlgolf.de"
>
> Wow, a spammer who tries to greet my host directly :)
>
> But ok, you're right, I think some spam could be refused with a helo-check
> (hosts pretending to be aol/yahoo/etc.).
>
> But heuristic checks (helo-name has to match hostname) aren't an option.
> Checks for the usual faked helo-names are ok.
I have also seen HELOs that are nothing by MY own IP address. That's pretty
much an indication of spam...
I'm not sure about HELOs that are IPs. How many legit email would be
blocked by that?
