On Wed, 8 Mar 2017 22:46:24 -0500 "Kevin A. McGrail" <KMcGrail at pccc.com> wrote: > Would parsing the To and Cc headers and comparing to @Recipients for > what remained tell you what would be a Bcc? Yes, although you'd obviously only be seeing those Bcc: recipients in a domain or domains handled by your server. Regards, Dianne.