Murder - MTA --> Auth required on frontend

[shabahang elmian]

Hello,

I have a problem on murder env.
Env:
1 MTA on postfix (redhat221)
1 frontend+Mupdate (redhat101)
2 backends (redhat103, redhat112)

if i pont the MTA to backend(mailbox_transport = lmtp:redhat101.example.com:2003), it works on the backend mail boxes.
but when pointing MTA to frontend ,its getting a error as follow:
Aug 14 10:39:59 localhost postfix/lmtp[5717]: 31E182408EF: to=<test112_1 at example.com>, relay=redhat101.example.com[10.131.57.101]:2003, delay=0.29, delays=0.12/0.01/0.16/0, dsn=4.0.0, status=deferred (host redhat101.example.com[10.131.57.101] said: 430 Authentication required (in reply to MAIL FROM command))



I would be thankful if you could help me on the problem.
Best regards,
Shabahang

-----------------------------------------
Config on frontend :
[root at redhat101 ~]# egrep -v "^#|^$" /etc/cyrus.conf 
START {
  # do not delete this entry!
  recovercmd="ctl_cyrusdb -r"
  # this is only necessary if using idled for IMAP IDLE
  idledcmd="/usr/lib/cyrus-imapd/idled"
}
SERVICES {
  # add or remove based on preferences
  mupdate       cmd="/usr/cyrus/bin/mupdate -m" listen=3905 prefork=1
  imap          cmd="proxyd" listen="imap" prefork=5
  imaps         cmd="proxyd -s" listen="imaps" prefork=1
  pop3          cmd="pop3d" listen="pop3" prefork=0
  pop3s         cmd="pop3d -s" listen="pop3s" prefork=0
  kpop          cmd="pop3d -k" listen="kpop" prefork=0
  nntp          cmd="/usr/lib/cyrus-imapd/nntpd" listen="nntp" prefork=0
  nntps         cmd="/usr/lib/cyrus-imapd/nntpd -s" listen="nntps" prefork=0
  sieve         cmd="timsieved" listen="sieve" prefork=0
  lmtp          cmd="/usr/cyrus/bin/lmtpproxyd" listen="0.0.0.0:lmtp" prefork=0
  # these are only necessary if receiving/exporting usenet via NNTP
  # at least one LMTP is required for delivery
  # this is only necessary if using notifications
}
EVENTS {
  # this is required
  checkpointcmd="ctl_cyrusdb -c" period=30
  # this is only necessary if using duplicate delivery suppression,
  # Sieve or NNTP
  delprunecmd="cyr_expire -E 3" at=0400
  # this is only necessary if caching TLS sessions
  tlsprunecmd="tls_prune" at=0400
}
[root at redhat101 ~]# egrep -v "^#|^$" /etc/imapd.conf 
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
admins: cyrus
sievedir: /var/lib/imap/sieve
sendmail: /usr/sbin/sendmail
hashimapspool: true
sasl_pwcheck_method: saslauthd
sasl_mech_list: PLAIN PLAIN+TLS LOGIN DIGEST-MD5 CRAM-MD5
tls_cert_file: /etc/pki/cyrus-imapd/server.pem
tls_key_file: /etc/pki/cyrus-imapd/server.pem
tls_ca_file: /etc/pki/cyrus-imapd/server.pem
tls_ca_path: /etc/pki/cyrus-imapd/
allowplaintext: yes
redhat112_password: password
redhat103_password: password
proxy_authname: cyrus
allowanonymouslogin: yes
lmtp_admins: cyrus
[root at redhat101 ~]# 
config on backend : 
[root at redhat103 ~]# egrep -v "^#|^$" /etc/cyrus.conf 
START {
  # do not delete this entry!
  recovercmd="ctl_cyrusdb -r"
  # this is only necessary if using idled for IMAP IDLE
  idledcmd="idled"
}
SERVICES {
  # add or remove based on preferences
  imapcmd="imapd" listen="imap" prefork=5
  imapscmd="imapd -s" listen="imaps" prefork=1
  pop3cmd="pop3d" listen="pop3" prefork=3
  pop3scmd="pop3d -s" listen="pop3s" prefork=1
  sievecmd="timsieved" listen="sieve" prefork=0
  # these are only necessary if receiving/exporting usenet via NNTP
  # at least one LMTP is required for delivery
  lmtpcmd="lmtpd -a" listen="0.0.0.0:lmtp" prefork=1
  lmtpunixcmd="lmtpd" listen="/var/lib/imap/socket/lmtp" prefork=1
  # this is only necessary if using notifications
}
EVENTS {
  # this is required
  checkpointcmd="ctl_cyrusdb -c" period=30
  # this is only necessary if using duplicate delivery suppression,
  # Sieve or NNTP
  delprunecmd="cyr_expire -E 3" at=0400
  # this is only necessary if caching TLS sessions
  tlsprunecmd="tls_prune" at=0400
}
[root at redhat103 ~]# egrep -v "^#|^$" /etc/imapd.conf 
configdirectory: /var/lib/imap
partition-default: /var/spool/imap
admins: cyrus mupdateslave1 backend1
sievedir: /var/lib/imap/sieve
sendmail: /usr/sbin/sendmail
hashimapspool: true
sasl_pwcheck_method: saslauthd 
sasl_mech_list: PLAIN PLAIN+TLS
tls_cert_file: /etc/pki/cyrus-imapd/server.pem
tls_key_file: /etc/pki/cyrus-imapd/server.pem
tls_ca_file: /etc/pki/cyrus-imapd/server.pem
tls_ca_path: /etc/pki/cyrus-imapd/
allowplaintext: yes
allowanonymouslogin: yes
mupdate_server: redhat101
mupdate_username: cyrus
mupdate_authname: cyrus
mupdate_password: password
proxyservers: cyrus
proxy_password: password
lmtp_admins: cyrus
[root at redhat103 ~]# 

Config on MTA
[root at redhat221 ~]# grep lmtp /etc/postfix/main.cf |grep -v ^#
mailbox_transport = lmtp:redhat101.example.com:2003
lmtp_sasl_auth_enable = yes
lmtp_sasl_security_options = noanonymous
lmtp_sasl_password_maps = hash:/etc/postfix/lmtp_sasl_pass 
[root at redhat221 ~]# 
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