# Sending Domain and PTR must match

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Make sure you read [PTR Records and Reverse DNS](ptr-records-and-reverse-dns) before this page.&#x20;
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Always use subdomains in your MTA configuration.&#x20;

If your domain is bobshotdogs.com, and your IP address is 1.2.3.4, create a DNS A record called velocity.bobshotdogs.com pointing to 1.2.3.4.&#x20;

Next, open a support ticket with the owner of your IP addresses, usually your VPS hosting provider, and ask for a PTR record to be created for IP address 1.2.3.4 with hostname velocity.bobshotdogs.com.&#x20;

When you add your Velocity MTA server in the UI, make sure you specify the correct DNS records you just created.&#x20;

The Header Domain A record and PTR record for the IP set by the hosting provider must match.&#x20;

<figure><img src="https://2024949584-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FHNgw7cfnOYHQr0B6GDXr%2Fuploads%2FXxTvDQPTskkUgqLeFMGA%2FScreenshot%202024-01-09%20at%2011.11.41%E2%80%AFPM.png?alt=media&#x26;token=a796b0f3-d725-43f4-8b71-c5c8fb17e8f5" alt=""><figcaption></figcaption></figure>
