Auth USER lookup failed

[thecoudge]

I have dovecot working with PAM and Samba DC authentication for IMAP. However 
when I'm attempting to pass emails from postfix via LMTP
I don't actually need to authenticate LMTP I'm happy to check for valid users 
upstream.

I'm getting the error:
Feb 06 15:11:39 Debian-server postfix/local[178200]: ADF0E78713C: passing 
<dom.usern...@debian-server.sr.local> to transport=lmtp
Feb 06 15:11:39 Debian-server dovecot[178075]: auth: Error: 
static(dom.username): passdb doesn't support lookups, can't verify user's 
existence
Feb 06 15:11:39 Debian-server dovecot[178075]: 
lmtp(dom.usern...@debian-server.sr.local)<178233><GJ/9Nou/wWU5uAIAiShiCA:T2>: 
Error: auth-master: userdb lookup(dom.usern...@debian-server.sr.local): Auth 
USER lookup failed
Feb 06 15:11:39 Debian-server dovecot[178075]: lmtp(178233): Error: 
lmtp-server: conn unix:pid=178201,uid=111 [4]: rcpt 
dom.usern...@debian-server.sr.local: Failed to lookup user 
dom.userna...@debian-server.sr.local: Internal error occurred. Refer to server 
log for more information.


Doveconf -n:
auth_username_format = %Ln
disable_plaintext_auth = no
mail_gid = vmail
mail_location = maildir:/var/mail/virtual/%d/%n
mail_privileged_group = mail
mail_uid = vmail
namespace inbox {
  inbox = yes
  location =
  mailbox Drafts {
    special_use = \Drafts
  }
  mailbox Junk {
    special_use = \Junk
  }
  mailbox Sent {
    special_use = \Sent
  }
  mailbox "Sent Messages" {
    special_use = \Sent
  }
  mailbox Trash {
    special_use = \Trash
  }
  prefix =
}
passdb {
  args = mail
  driver = pam
}
plugin {
  sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = " imap lmtp lmtp"
service auth {
  unix_listener /var/spool/postfix/private/auth {
    group = postfix
    mode = 0666
    user = postfix
  }
}
service lmtp {
  unix_listener /var/spool/postfix/private/dovecot-lmtp {
    group = postfix
    mode = 0600
    user = postfix
  }
}
ssl_cert = </etc/dovecot/private/dovecot.pem
ssl_client_ca_dir = /etc/ssl/certs
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
protocol lmtp {
  passdb {
    args = allow_all_users=yes
    driver = pam
    name =
  }
}
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