They are confused. They are saying that the reverse DNS of your IP resolves to a "dialup or DSL network" -- but they almost certainly can't know that.
Of course, they can. Stop the FUD and lies when your bogus ideology isn't adhered to.
I was afraid I was going to have to keep the FUD, lies, and bogus ideology to myself. :( I guess all I'm left with is facts to use in this E-mail.
Fortunately, decent anti-spam software won't block your mail, so this is a non-issue for most people.
MXs getting bombed from infected PCs on subscriber access network is HUGE issue for every MX on the planet, 30% - 40% of all abuse traffic is from these networks, 99+% of traffic from these networks is abuse.
And, at 1 billion spams a day, that's at least 300,000,000 E-mails a day coming from those networks. At 99+% of traffic from those networks being abuse, that's up to 3,000,000 legitimate E-mails/day being blocked.
Probably over 90% of all infected mail is from these networks.
So you can block 90% of viruses and 40% of spam in exchange for blocking millions of legitimate E-mails.
Like C/R, it is FUSSP (see http://www.rhyolite.com/anti-spam/you-might-be.html ). It works great on one machine under a given set of conditions, but fails (a billion legitimate E-mails blocked as spam each year) if everyone does it.
-Scott
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