Set up Google Postmaster Tools

Google Postmaster Tools (GPT) is a service Gmail provides free of charge that shows data about your sending reputation and Gmail spam rates. (Gmail does not notify senders when emails are marked as spam for privacy reasons.)

Check out our blog article to learn more about the power of Google Postmaster Tools!

Follow the steps below to set up Google Postmaster Tools for your CIO-Specific Subdomain. The subdomain is a combination of your account number and domain— like cioXXXXXX.yourdomain.com.

  1. Login or sign up for a Google Postmaster Tools account at https://www.gmail.com/postmaster/. You’ll need your Customer.io subdomain; we’ll show you how to find it in the next step.

  2. To locate your subdomain in Customer.io: go to Workspace settings > Email and click Manage Domain. The subdomain is a combination of the Host Name of your MX or SPF records plus your root domain.

    Find your mx record to determine your CIO-specific subdomain
    Find your mx record to determine your CIO-specific subdomain

  3. Copy the Host name record from the previous step and paste it in the domain section of your Google Postmaster Tools signup (left). Then add your root domain to the end of the record to assemble your Customer.io-specific subdomain (right).

    Add your CIO sudbdomain to Google Postmaster tools
    Add your CIO sudbdomain to Google Postmaster tools
    Add your root domain to assemble your complete, CIO-specific subdomain
    Add your root domain to assemble your complete, CIO-specific subdomain

  4. (Optional) Grant Customer.io read-access to your account so we can help you troubleshoot deliverability issues.

    1. In Google Postmaster Tools, click the three vertical dots by your domain then click Manage Users.
      The three dots and Manage Users option displays in the top right of Google Postmaster Tools.
      The three dots and Manage Users option displays in the top right of Google Postmaster Tools.
    2. Click the red icon.
      An image showing steps 2 through 3. The plus sign is in the bottom right. The email address field pops up in the middle of the screen.
      An image showing steps 2 through 3. The plus sign is in the bottom right. The email address field pops up in the middle of the screen.
    3. Enter ami@customer.io in the email address field.
    4. Click Next to finish.

Now you can monitor your sending domains for Customer.io in Google Postmaster Tools. If you gave us read-access, we’ll also be able to better troubleshoot deliverability issues with you!

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