Dedicated sending domains

A dedicated sending domain lets your emails go out from a domain you control instead of relying on shared sending infrastructure. Without one, some inboxes show a technical sending domain next to labels such as via, mailed-by or signed-by. With one, your sending identity stays consistent and your sender reputation is easier to manage.

Use a subdomain of your main domain, such as one starting with mail or email. That can help keep your email reputation separate from your website and business inboxes.

To set it up:

• Go to Settings, then Email Services, and open Dedicated Domain and IP.
• Click Add Domain, enter your domain or subdomain and click Add & Verify.
• Choose the automatic option. It detects supported DNS providers and adds the records after you sign in and authorize. Otherwise, copy the TXT, CNAME and MX records into your DNS manually.
• Wait for the Verified status. DNS changes can take up to 48 hours to spread.

You can also add a DMARC record, a TXT entry named _dmarc. Start with p=none, which monitors traffic without taking action, then move to quarantine or reject later. If your root domain already has one, you can skip it for the subdomain.

Your From address should use the same domain as your selected sending domain. HLB flags a mismatch or a missing DMARC record before a new campaign sends.

A dedicated domain improves authentication alignment, but inbox placement still depends on your sender reputation, message quality, engagement and sending volume. If you send around 200,000 or more emails a month, you can also buy a dedicated IP, assign it to your domain and set up reverse DNS to associate the IP address with a hostname.