virtual users ?

hi all

many thanks to all that have assisted with my question re the setup of
tmda-cgi, your help has been invaluable

i have one final question.

the virtual user stubs available with tmda-cgi assume that a virtual
user account, at minimum, is setup before any authentication takes
place via one of the available methods, file,remote etc...

is it possible to "NOT" require a local virtual user account to be
present until the authentication process ?

in this way the installation can be fully automated for users wanting
to "enable" tmda for there addresses.

e.g

[email protected] authenticating via pop3 (via our internal pop3
server) wants to "enable" tmda for his email address.

[email protected] does NOT want to enable tmda so no account is setup

am i making sense ?