Asking someone to change their domain name to match an SA rule seems a bit extreme to me! Why not propose that de establish a gmbh 2nd level for companies, and make him rss.gmbh.de?
FROM_DOMAIN_NOVOWEL was logged for only 3 messages here yesterday, of 1.3 million logged as scoring 7.0 and higher. All 3 were fps: privatehealthmgmt.com umdnj-secure.com (twice) (That second one had a long consonant string to the left of the @ sign.) It is perhaps extreme, but even if the rule is fixed not to FP, I suspect (but have no data) there will be lingering trouble from older installations. From the business point of view one has to weigh the cost of FPs and the cost of changing the name. I would probably change names, since it really isn't that hard.
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