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Documentation Index

Fetch the complete documentation index at: https://support.jetemail.com/llms.txt

Use this file to discover all available pages before exploring further.

This guide takes a brand-new JetEmail account and a fresh cPanel/WHM server through every step required to send authenticated mail through the JetEmail relay. The cPanel plugin handles the Exim configuration for you, so the heavy lifting is one command on the server.
Two ways to handle the many domains on a cPanel/WHM server:
  • Free tier: Add and verify every sending domain in the dashboard (step 2). Mail from any unverified sender will be rejected. Fine for a small server, tedious for a busy one.
  • Pro subscription: Enable Allow any domain on the SMTP user (step 3). The server can send from any domain hosted on it without preconfiguring each one in the dashboard. You still need to publish SPF on every sending domain — the plugin’s --add-spf flag (step 5) does this for you.
See SMTP users → permission modes for the full comparison.
The cPanel plugin supports AlmaLinux, Rocky Linux, and CloudLinux only. Ubuntu is not yet supported. If you’re on Ubuntu, follow the Exim guide instead.
1

Sign up for JetEmail

Create an account at jetemail.com, then open the dashboard at dash.jetemail.com.
2

Add and verify your sending domain

  1. In the dashboard, go to Outbound → Domains
  2. Add the domain you send from (e.g. example.com)
  3. Publish every DNS record the dashboard shows you (SPF, return-path, DKIM, DMARC, feedback) at your DNS provider
  4. Wait until the domain shows as verified
For a full breakdown of the records, see Email authentication.
3

Create an SMTP user

  1. Go to Outbound → SMTP in the dashboard
  2. Click Create SMTP
  3. Set a Username and strong Password
  4. Leave Quota at 0 for unlimited, or set a per-user limit
  5. On Pro plans, toggle Allow any domain on so the user can send from every domain on the server without each one being verified in the dashboard. On the free tier, leave this off and make sure every domain you intend to send from has been added and verified in step 2.
With Allow any domain on, you skip per-domain dashboard verification but you still need SPF published on every sending domain (see SMTP allow any domain). The --add-spf flag in step 5 takes care of this for every domain on the server.
Keep the username and password ready for the next step.
4

Install the JetEmail cPanel plugin

SSH to your server as root and run:
curl -O https://cdn.jetemail.com/plugins/cpanel/install-cpanel.sh
chmod 755 install-cpanel.sh
./install-cpanel.sh
This installs the JetEmail repository and the jetemail-cpanel command. It does not configure Exim yet.
5

Configure the relay

Run the install command with the SMTP credentials from step 3:
jetemail-cpanel install \
  --smtp-user YOUR_SMTP_USERNAME \
  --smtp-pass YOUR_SMTP_PASSWORD \
  --add-spf \
  --domain-lockdown
Recommended flags:
  • --add-spf — adds the JetEmail SPF include to every domain on the server
  • --domain-lockdown — adds the Domain Lockdown _jm TXT record to every domain so only your account can send from them
Prefer a GUI? After the install script runs, you can complete configuration through the JetEmail plugin in WHM instead.For the full flag reference, see the cPanel plugin docs.
6

Send a test message

Send a message from any cPanel account on the server to an external address and confirm it lands. Then open the JetEmail dashboard’s Logs view to confirm the message was accepted and authenticated.If something looks wrong, the SMTP block error reference explains the most common rejection codes.

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What the plugin changes

The plugin makes the following changes to your Exim configuration so you don’t have to:
  • Routes outbound mail through relay.jetsmtp.net with your SMTP credentials
  • Adds spf.jetsmtp.net to Exim’s additional SPF hosts
  • Trusts JetEmail’s inbound IPs (senderverifybypass + trustedips)
  • Enables SRS (Sender Rewriting Scheme) for forwarded mail
  • Disables remote HELO checks
  • Enables and configures DMARC for every domain
  • Optional (--domain-lockdown): adds the _jm TXT record on every domain
  • Optional (--add-spf): enables and configures SPF on every domain

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Next steps

Domain Lockdown

Stop other JetEmail accounts from sending as your domains.

DMARC

Tighten your authentication policy once mail is flowing.