On 2/22/2007 14:47, Ronnie Streff wrote: > This would also help facilitate rule making for routing postings to > folders, and spam blockers (like that nasty earthlink beast) that block > unknown e-mail addresses. > Generally, server-side filters filter on the envelope-sender address, not the 'From:' address. The 'From:' address is not available for server-side processing until the mail server accepts the entire message, because the 'From:' address is part of the DATA portion of the SMTP transaction. On the original message from the message author to the list address, the envelope-sender address and the 'From:' address will almost always be the same. When the message is distributed by the LISTSERV server, the envelope-sender address will be in the form owner-$listname@$listhost; the 'From:' address will not be changed. Most modern email clients can be configured to filter on the 'Return-Path' header, which contains the envelope-sender address. -- Paul Russell, Senior Systems Administrator OIT Messaging Services Team University of Notre Dame [log in to unmask]