Add and verify a sending domain

Ha Tang only sends from a domain you have added and verified. Verifying proves to Gmail, Outlook and other mailbox providers that your email really comes from you, which is the first thing they check before deciding between the inbox and the spam folder. Each domain gets its own DKIM key and its own return-path subdomain.

You need the Manage level on the Email module to add or change domains, and access to your domain's DNS settings (Cloudflare, Mắt Bão, P.A Việt Nam, GoDaddy or wherever your DNS is hosted).

Choose the domain

The domain in your sender address must match a verified domain exactly. To send as [email protected], add updates.mochuong.vn; adding mochuong.vn alone is not enough.

Add the domain

1. Open Email → Domains.
2. Type the domain or subdomain in Domain, for example tin.mochuong.vn.
3. Optionally open Advanced options:
   • Custom Return-Path: the subdomain for bounces, send by default. Change it only if send. is already used for something else. It cannot be changed later.
   • Tracking Subdomain: for example links, so tracked links use links.tin.mochuong.vn instead of a Ha Tang address.
   • Tracking options: Enable click tracking (on by default) and Enable open tracking.
4. Click Add domain.

The domain appears in the list with the status Not started, and its page opens with the records to publish.

Publish the DNS records

The domain page groups the records the way you will use them. Copy each Name and Value with the copy button next to it; never type a DKIM key by hand.

What each one does:

• DKIM signs every email with your domain's key, so receivers can tell it was not changed or forged.
• MX and SPF on send. handle bounces and authorize Ha Tang's mail servers to send for your domain. They sit on the send. subdomain, so they never touch the SPF or MX records your main domain already has for Google Workspace, Microsoft 365 or your hosting.
• DMARC tells receivers what to do with email that fails these checks. It does not block verification, but Gmail and Yahoo expect it from anyone sending in volume.

If your DNS host supports Domain Connect, the page shows a DNS Records panel with Auto configure with and your host's name. Click it, sign in at your DNS host and approve: the records are added for you and verification starts. If your DNS is on Cloudflare, the page links straight to your zone's DNS records instead.

Step-by-step instructions for common DNS hosts are in Add DNS records at your DNS host.

Verify

1. After publishing the records, click Verify DNS records on the domain page.
2. Ha Tang checks every record right away, then again every minute; the page refreshes by itself while the domain is pending.
3. Most domains verify within minutes. DNS changes can take up to an hour to reach everyone.

A domain is Verified when DKIM, MX and SPF all match and Amazon SES, which delivers the email, has confirmed the DKIM signature. DMARC, tracking and receiving records never hold verification back. Once verified, the button becomes Re-check DNS and Send test email appears.

What the statuses mean

Each record has its own status. Under a record that does not match, a short note says what Ha Tang found instead: found: nothing means no record exists under that name yet.

Troubleshooting

Deleting a domain (Delete on its page) stops all sending from it; emails still waiting to go out bounce.

For the API side (POST /domains, verification calls and webhooks), see the domains guide in the developer hub.