Installed ISPConfig 3.1dev - mostly went OK. Then moved system to a different network and was getting a virtual users unknown error which went away when I found the typo for the address of the DNS for the new network (doh :-( ) - which of course had stopped all sorts of other things I did not check cos they had been working before I moved the server (double doh :-( )) I have a virtual domain, and a user in that domain but when I try to set up my email client (OSX not a wondrous client) the client attempts to log into the virtual domain I get : postfix/smtpd: connect from 2-3-4-5 .static .tpgi .com .au[2 .3 .4 .5] <spaces inserted for benefit of forum s/w > postfix/smtpd: warning: 2-3-4-5 . static . tpgi .com .au[2 .3 .24 .5]: SASL PLAIN authentication failed: <ditto> postfix/smtpd: warning: 2-3-4-5 . staticv .vtpgi .com .au[2 .3 .4 .5]: SASL PLAIN authentication failed:<ditto> postfix/smtpd disconnect from 60-242-236-219 .static .tpgi .com .au[60 .242 .236 .219]<ditto> dovecot: imap-login: Disconnected: Inactivity (auth failed, 2 attempts in 180 secs): user=<me@mydomain .com .au>, method=PLAIN, rip=2 .3 .4 .5, lip=1 .2 .3 .4 <und so weiter> the client reports that it is unable create a login. Sadly this seems to be the extent of the logging information. Any suggestions greatly appreciated.