Problem

How to setup outmail (outbound SMTP) for the Exim mailserver in WHM or cPanel?

Solution

Follow the guide below to configure Exim to use Outmail as an outbound smarthost.

1. Login to your cPanel & WHM Admin Panel as an Administrator.  

2. Go to Home -> Service Configuration

3. Click on the 'Exim Configuration Manager' button

4. Click the 'Advanced Editor' tab

5. In the section marked 'Section: AUTH' add the following lines:-

outmail_login:
driver = plaintext
public_name = LOGIN
client_send = : OUTMAILUSERNAME : OUTMAILPASSWORD

Where OUTMAILUSERNAME and OUTMAILPASSWORD are your outmail credentials provided on sign-up.

6. In the section marked 'Section: ROUTERSTART' add the following lines:-

send_thru_outmail:
driver = manualroute
domains = ! +local_domains
transport = outmail_smtp
route_list = * mxXXXXXX.smtp-engine.com

Where mxXXXXXXX.smtp-engine.com is the server provided on sign-up.

7. In the section marked 'Section: TRANSPORTSTART' add the following lines:-

outmail_smtp:
driver = smtp
port = 2525
hosts = mxXXXXXX.smtp-engine.com
hosts_require_auth = mxXXXXXX.smtp-engine.com

Where mxXXXXXXX.smtp-engine.com is the server provided on sign-up. You can use either 2525, 25, 8025 or 587 as the port.

8. Click the SAVE button, and exim should restart.

Once it has restarted the outbound emails should all be sent through outmail.

Additional notes

For more information please see the Exim Documentation on the manualroute router.