How to authenticate a sending email domain
Prove that the company's domain is yours by publishing three records in the DNS. Without this, emails may get dropped along the way.
2 min readBasicUpdated on November 12, 2026
Where to find it in Cognizy
Video lesson coming soon. For now, follow the steps below.
For Cognizy emails to reach customers' inboxes, Gmail, Outlook, and other providers need to know that the domain is yours. You register the domain, copy three CNAME records to the panel where the domain is hosted, and request verification. Your current email inbox keeps working normally.
Where to find it in Cognizy
Before you start
- Only the owner and admins can manage channels.
- Have access to the domain's DNS panel (Registro.br, Cloudflare, your hosting provider…) or the contact of whoever manages it.
- Use the company's domain, without www. Public email domains, like Gmail and Hotmail, can't be authenticated.
Step by step
- Step 1:
In the footer of the menu, click Settings.
- Step 2:
Under Channels, click Email.
- Step 3:
At the top of the screen, click Add domain.
- Step 4:
In Domain, type the company's domain, without www (in the example, studiovidaleve.exemplo), and click Add.
- Step 5:
The domain appears as Waiting for DNS, with the list Publish these records in your domain's DNS. Use Copy next to each name and value. If someone else manages the DNS, click Copy instructions to send and send it to them.
- Step 6:
In the domain's DNS panel, create a CNAME record for each line in the list, pasting the copied name and value. The _dmarc TXT record is recommended, but not required. If the panel completes the domain automatically in the name field, enter only the first part (for example, em1234).
- Step 7:
Go back to Cognizy and click Verify now. DNS can take up to 48 hours to propagate; Cognizy also checks automatically every hour.
- Step 8:
Once the records are found, the domain switches to Verified, with the verification date. You can now create the email channel with this domain.
How to know it worked
The domain appears as Verified under Settings › Channels › Email. Emails sent with it go out signed by your company.
If something goes wrong
Hours have passed and it's still showing Waiting for DNS.
Check in the DNS panel whether the three records are of type CNAME and whether the name doesn't have the domain repeated (em1234.yourdomain.com.br.yourdomain.com.br). Fix it and click Verify now.
It shows that the domain is already authenticated by another organization.
The same domain can only belong to one company in Cognizy. Remove it from the other company or contact support.
I don't have access to the DNS panel.
Click Copy instructions to send and send the text to whoever manages the website or to your hosting support team.
Next step
With the domain verified, create the email channel with the company's sender address.
Sign in with your Cognizy account to save your progress.
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