Introduction
If you want or need to setup your mail server to send all outgoing mail to a specific server which will handle the delivery to the recipients you need to setup a SMTP relay or smarthost.
Prerequisites
- You need to know the hostname of the SMTP server which is going to relay the mail for your mailserver, which is smtprelay.snel.com in our case
- This article assumes that no authentication is necessary on the SMTP relay server
- This article is written for cPanel with Exim
- You need to have the login details of WHM ready
Step 1: Login on WHM
Go to https://x.x.x.x:2087 (replace x.x.x.x with the IP address of your server).
Step 2: Configure the MTA
Within WHM navigate to: Main > Service Configuration > Exim Configuration Editor, click on the Advanced Editor button and search on the page for “Section: POSTMAILCOUNT” and add the following:
- smart_route:
- driver = manualroute
- domains = ! +local_domains
- ignore_target_hosts = 127.0.0.0/8
- transport = remote_smtp
- route_list = * smtprelay.snel.com::587
- no_more
If “Section: POSTMAILCOUNT” is not available proceed to step 3, otherwise proceed to step 4.
Step 3: ONLY IF “Section: POSTMAILCOUNT” is not available
On the same page search for “Section: ROUTERSTART” and add the following:
- smart_route:
- driver = manualroute
- domains = ! +local_domains
- ignore_target_hosts = 127.0.0.0/8
- transport = remote_smtp
- route_list = * smtprelay.snel.com::587
- no_more
Step 4: Save changes
Click on the “Save” button on the bottom of the page to save changes and restart the mailserver to apply the new configuration.
