The only conclusion I can come to at this point is that Hughes email filtering doesn't work on external accounts. Filtering works if I send an email from one of my Hughes addresses to another of my Hughes addresses, but it doesn't work when an external account sends an email to my Hughes account, I even tried filtering on To: and got the same results. In other words, if an email is received at the filtering account address that contains the email address of that filtering account in the To: field, then forward the email to my main account. Pretty ridiculous.
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