describe SKM_SPAM_LIST_B_236 SKM Rules body SKM_SPAM_LIST_B_236 m/jgsgfta\.com/i score SKM_SPAM_LIST_B_236 50.0
Style note: the m modifier to regexes is pointless for body rules. All EOL's are stripped out of the message prior to running body rules.
Shouldn't the 'body' type rule remove the HTML markup, so the remaining text is "http://www.jgsgfta.com/index.php?ID=JNL" ?
Yes, and your rule works for me when I paste your sample HTML into a text/plain email.
Any chance you can provide an mbox file of the exact email that's a problem?
Base64 encoding shouldn't be a problem for SA, but I'm wondering if there's some weirdness to the encoding or the HTML that isn't obvious from the HTML your posted.