I cannot send email by Zimbra.

I found this message in /var/log/zimbra.log


Apr 25 01:03:35 mail postfix/trivial-rewrite[11008]: fatal: ldap:/opt/zimbra/conf/ldap-vad.cf(0,lock|fold_fix): table lookup problem
Apr 25 01:03:36 mail postfix/trivial-rewrite[11009]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11009]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11010]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11009]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11009]: fatal: ldap:/opt/zimbra/conf/ldap-vad.cf(0,lock|fold_fix): table lookup problem
Apr 25 01:03:36 mail postfix/trivial-rewrite[11010]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11010]: error: dict_ldap_connect: Unable to set STARTTLS: -11: Connect error
Apr 25 01:03:36 mail postfix/trivial-rewrite[11010]: fatal: ldap:/opt/zimbra/conf/ldap-vad.cf(0,lock|fold_fix): table lookup problem

I fixed it by



changed ‘start_tls’ option in /opt/zimbra/conf/ldap-* from “yes” to “no” by this script

cd /opt/zimbra/conf/
for x in ldap-scm.cf ldap-transport.cf ldap-vad.cf ldap-vam.cf ldap-vmd.cf ldap-vmd.cf;
do cp $x $x.bak;
sed -i s/”start_tls = yes”/”start_tls = no”/g $x;
done

from : http://www.zimbra.com/forums/installation/13762-solved-expired-cert-5-0ga-can-cause-mail-delivery-failure.html