How to: Enable Sending Mail over IPv6
=====================================

The dns_ip6_lookup feature is disabled by default as of InterWorx Version 5.1.7.  As 
such, mail will not be sent via IPv6, unless manually configured to do so. 

.. contents::

To Enable Sending over IPv6
---------------------------

#. Log in to the server at the CLI as root, either via SSH or from the terminal
#. At the CLI, create a file named ``/var/qmail/control/dns_ip6_lookup``, with "1" as 
   the contents. This can be done as a one-liner, using ``echo``
   
   .. code-block::

      [root@server ~]# echo 1 > /var/qmail/control/dns_ip6_lookup
      [root@server ~]# cat /var/qmail/control/dns_ip6_lookup
      1
      [root@server ~]#

#. At the CLI, use a text editor to create a file named ``/var/qmail/control/senderip6``
 
   .. code-block::

      vim /var/qmail/control/senderip6

#. Add the sending domain and IPv6 address in the format ``domain:ip6 address``. For 
   example: 

   .. code-block::
      
      iwtest.net:2001:db8:0:1:1:1:1:1
    
#. Save and exit the text editor