"Now SPEWS lists my IP address as a source of spam, and advises mail servers to refuse my email - from my point of view, that's libel,"
They don't claim your IP is a source of spam, they claim spam comes from your ISPs netblock. No difference to you, but their claim is presumably true.
"Now SPEWS lists my IP address as a source of spam, and advises mail servers to refuse my email - from my point of view, that's libel," They don't claim your IP is a source of spam, they claim spam comes from your ISPs netblock. No difference to you, but their claim is presumably true.