In article ,
Peter Duniho wrote:

Probably his ISP is using one of those obnoxious black-hole lists that
automatically detects spam and adds IP ranges from which the spam originated
to its database.

The problem is that some people get so much spam that if they didn't
take drastic filtering measures they wouldn't get your email anyway --
they wouldn't have time to sift through the spam looking for it.

Of course, since a third of all spam these days is being
sent from compromised but otherwise legitimate users, this sort of idiotic
solution results in innocent bystanders getting their email blocked.

Not really. 'Compromised' broadband users infected with viruses that
turn them into spam zombies should still be sending their legitimate
email through their ISP's server, which will not be on the DUL-style
lists I assume you are refering to. There is plenty of collateral
damage from IP blocking, but the cause of those blocks is usually ISP
supported spam.

--
Ben Jackson

http://www.ben.com/