Error: Queue report unavailable – mail system is down

Zimbra reports “ Error: Queue report unavailable – mail system is down ”

We can find that it does not starts correctly the service postfix MTA. But the system shows that everything is working properly:

[zimbra@mail]$ zmcontrol status
Host mail.ttdconline.com
amavis                  Running
antispam                Running
antivirus               Running
ldap                    Running
logger                  Running
mailbox                 Running
memcached               Running
mta                     Running
opendkim                Running
proxy                   Running
service webapp          Running
snmp                    Running
spell                   Running
stats                   Running
zimbra webapp           Running
zimbraAdmin webapp      Running
zimlet webapp           Running
zmconfigd               Running

We reviewed logs and services and we see that the MTA is down:

[zimbra@mail]$ tail -f /var/log/mail.log
Jan 22 11:08:00 zcs postfix/postqueue[19195]: fatal: Queue report unavailable – mail system is down

[zimbra@mail]$ netstat -nlpt | grep 25
tcp        0      0 0.0.0.0:7025                0.0.0.0:*                   LISTEN      19017/java

[zimbra@mail]$locate master.pid
/opt/zimbra/data/postfix/spool/pid/master.pid

[zimbra@mail]$ zmmtactl stop

[zimbra@mail]$ mv /opt/zimbra/data/postfix/spool/pid/master.pid /opt/zimbra/data/postfix/spool/pid/master.pid_ori

[zimbra@mail]$ zmmtactl start
Rewriting configuration files…done.
Starting saslauthd…already running.
/postfix-script: starting the Postfix mail system
[zimbra@mail]$ postfix reload
/postfix-script: refreshing the Postfix mail system