OK, I've added that in. There's a choice "Any header" now which searches the following headers: Sender, X-Sender, Mailing-List, X-Apparently-From, X-Version, X-Sender-IP, Received, Return-Path, Delivered-To, List-Post, Date, Subject, To, From, Reply-to, X-AntiAbuse
I've also added another option "Envelope" which searches the actual From and To address used in the delivery. The 'To' address won't work properly, however, for messages retrieved from POP links, since when it is transferred to FastMail.FM the 'To' address is your FastMail.FM user name, not the original recipient.
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