Zimbra antispam and antivirus not working

If you notice that mails are getting stuck in deferred status you might have the same problem that i just had. Check the logs for a message like this (/var/log/zimbra.log)

Apr  3 21:44:54 mail01 postfix/smtp[9304]: connect to 127.0.0.1[127.0.0.1]:10024: Connection refused

First of all you should try to manually start the service

[root@mail01 conf]$ su zimbra -
[zimbra@mail01 conf]$ zmamavisdctl start
Starting amavisd...  The value of variable $myhostname is "mail01", but should have been
 a fully qualified domain name; perhaps uname(3) did not provide such.
 You must explicitly assign a FQDN of this host to variable $myhostname
 in amavisd.conf, or fix what uname(3) provides as a host's network name!

If you get this error you made a mistake like I did. I did gave the fqdn while setting up the server. You can fix this by executing

/opt/zimbra/libexec/zmsetservername -n mail01.demo

Then do an exit to get you back to the root shell and reboot