In this tutorial, I will be showing you how to add multiple domains on mailcow without using another IP. This method works on multiple domains with one mail server running on mailcow.

I will show you how I mapped DNS for the new domain. Send and receive emails on different email domains. Just rinse and repeat the process.

You MUST have a VPS with open port 25 to send emails.
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Install mailcow on RackNerd VPS
   • Emails with No Limits - Setup mailcow...  

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