Sorry to rehash this topic. I wasn't paying attention at the time and have been working through the old posts on the list's web forum. Has L-Soft developed any documents to better explain this problem? Are there any release notes for 16.0a? I cannot find where DMARC looks at the From: header as opposed to the SMTP MAIL FROM attribute, which is negotiated during the SMTP conversation. That value is usually reflected in the headers Return-Path: or Sender: That MAIL FROM is usually [log in to unmask]<mailto:[log in to unmask]>. It is unclear from the thread whether DMARC examines the From: header as opposed to the message sender. Thanks. matthew black california state university, long beach ############################ To unsubscribe from the LSTSRV-L list: write to: mailto:[log in to unmask] or click the following link: http://peach.ease.lsoft.com/scripts/wa-PEACH.exe?SUBED1=LSTSRV-L&A=1