How do I increase the maximum number of mails a particular domain can send in one hour in WHM?

This can be done directly from WHM.

1. Click the link “Modify an account in WHM”
2. Select the domain and click the Modify button
3. Scroll down to the option “Hourly Email by Domain Relayed”
4. Enter the allowed number of mails per hour for that domain
5. Click Save

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