How To Authenticate Domain In SendGrid

Updated on:

May 12, 2026

By:

Use this interactive demo to learn how to authenticate your sending domain in SendGrid.

Quick summary

Domain authentication in SendGrid proves to inbox providers that you own the domain you're sending from, improving email deliverability and reducing spam filtering. This process involves adding CNAME and TXT DNS records to your domain registrar so SendGrid can verify your sending identity.

Steps

Log into your SendGrid account and go to Settings in the left panel.
Find and select Sender Authentication.
Click Get Started under Authenticate Your Domain.
Select your DNS provider from the list (for example, Cloudflare).
Click Next to proceed.
Enter your website domain and click Next.
Copy the generated DNS records, then go to your domain registrar (such as GoDaddy or Namecheap) and open DNS Management. Add a new CNAME record for each of the first three entries, add a new TXT record for the last entry, and paste the values exactly as shown.

📌 Why this matters

Authenticating your sending domain in SendGrid is a critical step for any business that relies on email to reach customers. Proper domain authentication using CNAME and TXT DNS records signals to inbox providers like Gmail and Outlook that your emails are legitimate, directly boosting deliverability rates and protecting your sender reputation. Without domain authentication, marketing and transactional emails are far more likely to land in spam folders, undermining campaign performance. Setting this up correctly ensures your emails arrive in the inbox, builds trust with recipients, and meets modern email security standards like DMARC alignment.

Your product deserves an interactive demo

Start free

How to Add a Custom Domain in SendGrid

How to Create a Simple Email Signature in SendGrid

How to Test the Spam Scores in SendGrid