Yes...a <Tab> is required immediately following the address in userdb. The biggest problem I had getting this script to work was the proper format of userdb because of copy/paste. Refer to
for the proper format. During testing I would pipe the output to a junk file to check the format before finalizing, comparing to an existing (working) userdb if necessary. That's what finally got me the working script I posted earlier in this thread. It has been working solid in production for over 3 months now with no problems.
Remember though...this does not change your user login for ISPConfig access (ie FTP). That username remains as XXX.DOM_username.