Fix for "CentOS 6 lacks the required support for TCP dictionaries"

[arvanus]

For CentOS 6 users, here is the fix:
Postfix 2.11 unter CentOS 6.6
https://www.bjoerns-techblog.de/2015/01/postfix-2-11-unter-centos-6-6/
Author: Björn https://www.bjoerns-techblog.de/author/bjoern-amann/

$vi /etc/yum.repos.d/postfix.repo and add the following lines:

[postfixrepo]  
name=EL-$releasever Postfix repo  
baseurl=http://repos.oostergo.net/$releasever/postfix-2.11  
enabled=1  
gpgcheck=1  

su -c 'rpm --import http://repos.oostergo.net/RPM-GPG-KEY'

Edit /etc/yum.repos.d/CentOS-Base.repo
exclude=postfix-*

*and restart postfix