Domain authentication ensures your emails are trusted by inbox providers like Gmail, Outlook, and Yahoo. By configuring DKIM, DMARC, and CNAME, you prove that your domain is legitimate and authorized to send emails through SendPost.
This significantly improves deliverability, reduces spam folder complaints, and protects your brand from spoofing or phishing attacks.
Before You Begin
You will need:
Access to Your SendPost Account
To copy your unique authentication records.
Access to Your DNS Provider
Such as GoDaddy, Namecheap, Cloudflare, Hostinger, or AWS Route 53.
A Verified Sending Domain
The domain you want to authenticate.
Ability to Add DNS Records
TXT and CNAME records must be editable.
Once these are ready, you can begin setting up domain authentication.
Step-by-Step Instructions
Configure DNS Records
Click on Settings and then Domain to view your DNS records.
Click on “New” to add a new domain
Add the domain name (for example, sales.co.in).
Please ensure you enter only the domain name, not an email address,
Select the sub-account you want to associate it with.
Click on Submit
The records will appear below the domain name.
Add all the required NAME, DKIM, and DMARC records along with their values to your hosting account.
Verify Configuration
Once you've added the records, check that your domain has been successfully whitelisted.
All the records should appear in green, indicating they're correctly configured.
Tips & Best Practices
Always authenticate before sending:
Sending without authentication increases the risk of spam or bounce issues.
Use “p=none” for DMARC initially:
This helps you monitor without blocking your emails.
Check DNS propagation:
DNS changes may take 5–48 hours to update globally.
Use branded tracking links:
Authenticated CNAME improves recipient trust and click accuracy.
Conclusion
Setting up DKIM, DMARC, and CNAME is essential for strong email deliverability and domain reputation. With proper authentication, your emails are more likely to land in the inbox, maintain brand credibility, and avoid spam filters.
Once all records are verified in SendPost, you’re fully ready to send authenticated, high-trust emails from your domain.