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IONOS - Authenticate your domain (DKIM)

As explained in our dedicated article Authenticate your domain to improve the deliverability of your emails (DKIM), you must add DNS records to your web host to authenticate your domain.

In this article, we will explain how to authenticate your domain on IONOS.

Before you start

👆Step 1: Access the Domains page

To access the Domains page:

  1. In Sendinblue, click on your name at the top-right side of the screen.
  2. Select Senders & IP.
  3. Click Domains.

⚙️ Step 2: Generate the DNS records

To generate the DNS records that you will use to authenticate your domain:

If you haven't added your domain yetIf you already added your domain
  1. Click Add a domain.
  2. Enter the domain name you wish to use to sign your emails and click Save. In our example, we are using the domain
  3. The DNS records (Sendinblue code and DKIM) that need to be added to your domain host display.

🚀 Step 3: Add the DNS records to your domain host

  1. Open a new window in your navigator and access your IONOS account.
  2. Click on Menu and select Domaines & SSL.
  3. Select the domain name that you want to delegate.
  4. Go to the DNS tab.
  5. Click Add record.
  6. Create a DNS entry of TXT type: DKIM. 
  7. Copy the Hostname field from Sendinblue and paste it into the Nom (Name) field of Ionos.
  8. Copy the Value field from Sendinblue and paste it into the Valeur (Value) field of Ionos.
  9. Leave the TTL field as is and click Save
    ❗️ Important
    It may take up to 24-48 hours for DNS changes to propagate fully.
  10. Go back to Sendinblue and click Verify & Authenticate or Authenticate. 
  11. Once the configuration is complete, a green check appears next to the Value field in Sendinblue.

Your domain has been authenticated, and your emails will now be signed with your own domain name in your recipients' mailbox! 🚀⬇️


⏭️ What's next?

🤔 Have a question?

If you have a question, feel free to contact our support team by creating a ticket from your account. If you don't have an account yet, you can contact us here.