My effort to install Cyrus has been largely successful. I would expect to see a function to bounce email with a "5.1.1 User unknown" error. But I haven't seen this function described or even acknowledged within Cyrus. As far as I understand, I need a hook for my MTA (Sendmail) to query. Does one of the /usr/cyrus/bin utilities provide this function? It seems easy enough to roll my own. How do other Cyrus administrators handle this requirement? Thanks, Jim Schueler Motor City Interactive ---- Cyrus Home Page: http://cyrusimap.web.cmu.edu/ Cyrus Wiki/FAQ: http://cyrusimap.web.cmu.edu/twiki List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html