How-To disable Exim IPv6

Introduction

When IPv6 is disabled for Exim, no IPv6 activities take place. AAAA records are never looked up, and any IPv6 addresses that are listed in local_interfaces, data for the manualroute router, etc. are ignored. If IP literals are enabled, the ipliteral router declines to handle IPv6 literal addresses.

Procedure

1. Access your server via WHM as the root user
2. Navigate to "Home / Service Configuration / Exim Configuration Manager"
3. Select the "Advanced Editor" tab
4. Locate and click the button "Add additional configuration setting" (it's just above Section: BEGINACL")
   
5. Select from the dropdown the option "disable_ipv6" and type "true" into the value field
   
6. Scroll to the bottom of the page and select "Save" to commit your changes