[Dovecot] Proxying LMTP - Auth PASS lookup failed

[Edward Carraro]

> Well, you'd of course replace the 1234 with the actual LMTP port that the
> backend is listening on. There is no default port assigned for LMTP, so I
> don't know what you've used. Or have you added any inet_listener to LMTP at
> all?
>
>
wasnt using inet_listener since I was using UNIX sockets

Switching to inet_listener and changing port to 24 on the proxy

10-master.conf

service lmtp {
  #unix_listener /var/spool/postfix/private/dovecot-lmtp {
  #group = postfix
  #mode = 0666
  #user = postfix
  #}

  # Create inet listener only if you can't use the above UNIX socket
  inet_listener lmtp {
    port = 24
  }
}

postfix/main.cf
virtual_transport = lmtp:om005pp1:24  #lmtp:hostname:port - om005pp1 is the
proxy itself
mailbox_transport = lmtp:om005pp1:24

Postfix shows

postfix/lmtp[21872]: C23824502C4: to=<user at dev.domain.com>,
relay=om005pp1[192.168.12.204]:24, delay=0.06, delays=0.02/0.01/0.01/0.03,
dsn=4.5.2, status=deferred (host om005pp1[192.168.12.204] said: 402 4.5.2
Error: command not recognized (in reply to end of DATA command))

postfix/master.cf on the backend dovecot is
24       inet  n       -       n       -       -       smtpd



when postfix/master.cf on the backend dovecot is
24       inet  n       -       n       -       -       lmtp

proxy postfix shows

postfix/lmtp[21971]: 86CD04502C4: to=<user at dev.domain.com>,
relay=om005pp1[192.168.12.204]:24, delay=30, delays=0.02/0.01/0.01/30,
dsn=4.4.0, status=deferred (host om005pp1[192.168.12.204] said: 451 4.4.0
Remote server not answering (DATA output timeout) (in reply to end of DATA
command))