( SOLVED )Postifx and virtual users (user unknown)

[redhatdude at bellsouth.net]

Ok I finally got postfix to work with virtual users and cyrus-imapd.  
I should write a tutorial for those that will encounter the same  
problem.
My problem was with local_recipient_maps. Even though it's commented  
out in main.cf the default is local_recipient_maps =  
unix:passwd.byname $alias_maps
In my sasl section within main.cf I had the following:

smtpd_sasl_auth_enable = yes
broken_sasl_auth_clients = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sender_login_maps = hash:/etc/postfix/sasl_senders
smtpd_recipient_restrictions = permit_sasl_authenticated,  
reject_unauth_destination
smtpd_sasl_security_options = noanonymous
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

All I had to do was adding the smtpd_sender_login_maps look up table  
to my local_recipient_maps. In the end it looks like this:
local_recipient_maps = unix:passwd.byname $alias_maps hash:/etc/ 
postfix/sasl_senders

For those who don't know, the new users map is just a file with  
user at mydomain.com on the left and user name on the right  
( user at somedomain.com    user ) then you run the command postmap / 
path/to/this/file and the table is created for postfix to use it.

> Sure :| If you review one of my previous answers in the thread about
> Cyrus-IMAPd you will find a warning about using the create on post
> option of the autocreate patch. You now see the effect: each spam mail
> to a local domain but with a random, non existing account will create
> you a new mailbox.

if the spam email is directed to an unknown user and Postfix rejects  
it, then I have nothing to worry about those emails autocreating  
mailboxes in cyrus-imapd.
Thank you so much for your help Alexander.
EJ