How to use SMTPUTF8 with Exim

Introduction

In order to use SMTPUTF8 with Exim, you'll need to enable the following configurations. 

Procedure

1. Login to WHM as the root user
2. Navigate to: Home »Service Configuration »Exim Configuration Manager
3. Click on the Advanced Editor tab
4. Find the blue button that says "Add Additional Configuration Setting" and click on it
5. Add the following configurations:

   allow_utf8_domains = true
   
   dns_check_names_pattern = (?i)^(?>(?(1)\.|())[a-z0-9\xc0-\xff] (?>[-a-z0-9\x80-\xff]*[a-z0-9\x80-\xbf])?)+$
   
   smtputf8_advertise_hosts = *

6. Scroll to the bottom of the page and click the blue save button

Please review the Exim Documentation for the full information on these configurations:

Exim Documentation - Main Configuration