I'm still very confused, but I have finally gotten it to recognize all users. What changed from my previous message is that I deleted the static userdb, and added the system user to the /etc/dovecot/users file (but not to the passdb /etc/dovecot/passwd). Oddly, I had to set uid:gid and homedir for each entry in /etc/dovecot/users even though I have these set to default values ("default_fields = uid=vmail gid=vmail home=/local/mnt/home/%n").
I'm still confused about the static userdb, as well as if I need to configure in /etc/postfix/main.cf both the mailbox_command to use dovecot-lda and the virtual_transport = dovecot service.
-- Randall Gellens Opinions are personal; facts are suspect; I speak for myself only -------------- Randomly selected tag: --------------- (If you can't hear me, it's because I'm in parentheses)