[Dovecot] Problem switching from Dovecot LDA to LMTP - on dovecot 2.2.4

[Michael Long]

Dovecot LDA has been working fine for me but when I tried to follow the 
wiki and switch to LMTP I get:

Recipient address rejected: User unknown in local recipient table;
In postfix/main.cf I went from:
mailbox_transport = dovecot-spam
to
mailbox_transport = lmtp:unix:private/dovecot-lmtp

Added this:
service lmtp {
 unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
 }
}

protocol lmtp {
  mail_fsync = optimized
  postmaster_address = postmaster@domainname
  mail_plugins = sieve zlib
}

And some other pertinent parts of the config:

passdb {
  args = /etc/dovecot/passdb
  driver = passwd-file
}
passdb {
  driver = pam
}

protocol lda {
  mail_fsync = optimized
  auth_socket_path = /var/run/dovecot/auth-master
  deliver_log_format = msgid=%m: %$
  mail_plugin_dir = /usr/local/lib/dovecot
  mail_plugins = sieve zlib
  postmaster_address = postmaster
  quota_full_tempfail = yes
  rejection_reason = Your message to <%t> was automatically rejected:%n%r
  lda_mailbox_autocreate = yes
}