SpamAssassin: Your system administrator or ISP has implemented a policy to block SPAM (also known as unsolicited commercial e-mail). Each incoming e-mail is scanned for signs that it may be SPAM, and if it is determined that it's likely to be SPAM, it is altered to clearly reflect this, so that you — the user — can decide whether to delete or keep it.

When did my ISP become mccarthy.net? This filter is pure evil.