I've been running dovecot + postfix with a MySQL backend for a while now,
and been happy with it.

Now that I want to implement Sieve filtering, I discovered that I'm using
postfix's virtual transport instead of Dovecot's LDA.

Adding virtual_transport = dovecot to the main.cf file and 
dovecot   unix  -       n       n       -       -       pipe
  flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/deliver -f ${sender} -d
  ${recipient}

  to the master.cf file results in this:
  Jul 16 14:52:13 Leavenworth postfix/pipe[31344]: fatal: user=
  command-line attribute specifies mail system vmail group id 1008

That is the correct user + UID that owns the mail spool, and has been
handling the virtual transport.  Postconf -n is below; anyone have any
suggestions as to how to troubleshoot this further?

alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
config_directory = /etc/postfix
disable_vrfy_command = yes
hash_queue_depth = 2
hash_queue_names = incoming,active,deferred,bounce,defer,flush,hold
header_checks = regexp:/etc/postfix/header_checks
html_directory = /usr/share/doc/postfix
inet_protocols = ipv4, ipv6
mailbox_size_limit = 0
mailbox_transport = virtual
message_size_limit = 150000000
mydestination = leavenworth.sequestered.net
mydomain = sequestered.net
myhostname = leavenworth.sequestered.net
mynetworks = 192.168.0.0/16, 10.0.0.0/8, 127.0.0.0/8
proxy_read_maps = $local_recipient_maps $mydestination $virtual_alias_maps 
$virtual_alias_domains $virtual_mailbox_maps $virtual_mailbox_domains 
$relay_recipient_maps $relay_domains $canonical_maps $sender_canonical_maps 
$recipient_canonical_maps $relocated_maps $transport_maps $mynetworks 
$virtual_mailbox_limit_maps
relay_domains = proxy:mysql:/etc/postfix/mysql_relay_domains_maps.cf
sample_directory = /etc/postfix
setgid_group = vmail
smtp_tls_note_starttls_offer = yes
smtp_use_tls = yes
smtpd_client_restrictions = ${stress?reject_unknown_client_hostname}    
check_client_access cidr:/etc/postfix/cidr_access
smtpd_data_restrictions = reject_multi_recipient_bounce   
reject_unauth_pipelining
smtpd_helo_required = yes
smtpd_recipient_restrictions = permit_sasl_authenticated        
permit_mynetworks        reject_unauth_destination        
reject_unlisted_recipient             check_client_access 
cidr:/etc/postfix/whitelisted_senders        check_recipient_access 
hash:/etc/postfix/access        check_sender_access 
hash:/etc/postfix/undesirable_senders        check_sender_access 
regexp:/etc/postfix/dynamic        reject_non_fqdn_hostname        
reject_unknown_reverse_client_hostname        reject_rbl_client 
psbl.surriel.com        reject_rbl_client zen.spamhaus.org        
reject_rbl_client dnsbl.ahbl.org        reject_rbl_client bl.spamcop.net        
reject_rhsbl_sender rhsbl.ahbl.org        warn_if_reject reject_rbl_client 
dnsbl.sorbs.net        permit
smtpd_sasl_auth_enable = yes
smtpd_sasl_authenticated_header = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot
smtpd_timeout = 120
smtpd_tls_CAfile = /etc/postfix/mail.pem
smtpd_tls_cert_file = /etc/postfix/mail.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_use_tls = yes
virtual_alias_maps = proxy:mysql:/etc/postfix/mysql_virtual_alias_maps.cf
virtual_gid_maps = static:1008
virtual_mailbox_base = /usr/local/virtual
virtual_mailbox_domains = proxy:mysql:/etc/postfix/mysql_virtual_domains_maps.cf
virtual_mailbox_limit = 5120000000000
virtual_mailbox_maps = proxy:mysql:/etc/postfix/mysql_virtual_mailbox_maps.cf
virtual_minimum_uid = 125
virtual_uid_maps = static:1008

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