I've been told this can filter legitimate mail.
Agreed Mitch.. if you read the rest of my message, I had a long warning about that.
courier added a freemail concept, BUT, the yahoo servers send directly from the
webmail appliances, which are not mx's for the domain, and sometimes are not
reverse resolvable (setup delays? temprary dns failures?)
Hmm, I'd not thought of that particular form of false check.. However, there's also several others (ie: the ones I suggested before), and any one of them is a good reason not to use this rule with any significant score.
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