I saw an entertaining message thread from the August Courier maillist archives which asked the question I now have, but, I didn't see the answer I was after nor did the original poster get a sufficient answer, I suspect, although Sam answered each question without fault. Herein I am paraphrasing the thread:

Q: How do I get email sent to fo...@domain.com, domain.com being virtual (in userdb)?

MrSam: Set up fo...@domain.com username in userdb (and add the Maildirs)

Q: Ok, but how do I setup email for ba...@domain.com ?

MrSam: Add a ba...@domain.com username in userdb.

Q: OK OK but how do I receive email for ANYT...@domain.com ?

MrSam: Add a real user to the system and create a $HOME/.courier-default

Now, *I* think that the question that was REALLY being asked was this:

Q: How do I implement a postmaster-style account for virtual domains ala vchkpw?

Example:

I want all mail to users who are NOT in userdb for that virtual domain to go to postmaster@ that virtual domain.

Here's my directory structure:

userdb: use...@domain1.com use...@domain1.com ...etc...

virtual_domains_directory +---domain1.com_dir | +---user1_dir (./Maildirs under all users) | +---user2_dir | +---domain2.com_dir +---user1_dir +---user2_dir

Putting a .courier-default under the domain_dirs doesn't work as a catch-all.

How to do this?