What is Google Postmaster Tools and how do I set it up?


If you send a large volume of commercial emails to Gmail users, you can use Google Postmaster Tools (GPT) to analyze your email performance and help monitor deliverability issues.

What are Postmaster Tools?

Postmaster Tools is a free online tool provided by Google that provides marketers direct access to reputation, deliverability, security and performance diagnostics straight from Gmail about their email domains and IPs.

How to Setup Google Postmaster Tools

Postmaster Tools are domain based, and require you to add and verify you authenticated email domain to uniquely identify your email traffic and provide access to your email performance analytics.

To add a verify a new authenticated domain :

  1. Go to postmaster.google.com
  2. Login with a Gmail or GSuite email address that you wish to serve as the account to manage your Postmaster Tools data. Tip: If you have a team that may need access to Postmaster Tools data, it is recommended to create a new Gmail account just for Postmaster Tools where login credentials can be shared.
  3. On the bottom-right, click the “Add +” icon button
  4. In the box that pops up, enter your authentication domain and click “next”
  5. A unique verification TXT record will appear by default that must be added as a TXT record into your domain’s DNS to prove domain ownership. Example:
    google-site-verification=w_lOQZcHsUMgFKZgHNOWkXHRaI5Lxx3pfj5hp6k5DT0
  6. Having trouble? Google offers an alternative way to verify your domain through generating a CNAME record that can be added to your DNS. Example below:
    CNAME Label/Host: Filxcy77u2qt.example.email.com
    CNAME Destination Target: gv-uz3i6apskt4nyr.dv.googlehosted.com
  7. After adding your TXT or CNAME record, go back into Postmaster Tools and hover over the request domain and click the “More⋮” icon to the right of the domain.
  8. Click “verify” next to the domain.
  9. If you successfully added the correct verification record to your domain’s DNS, your new domain will be verified by Google and added into your Postmaster Tools account to begin collecting data. Postmaster Tools data will not populate retroactively and will only begin to be recorded from the date the domain is registered.

Note: To stay verified, do not remove the TXT or CNAME DNS record, even after the verification succeeds. (DNS changes may take some time and if we do not find the record immediately, we will check for it periodically.)

Delegated Domain to Your ESP for Hosting

If you use an email service provider (ESP) to deploy your email and have delegated your email domain to them for hosting via NS DNS entries, you must have your ESP help you with the DNS steps.

You can generate your TXT or CNAME verification record yourself, but will need to submit a support ticket with this unique verification information to your ESP and request them to add this into the DNS of your domain on your behalf, and notify you once completed. You can then continue with step 8.

Sharing Your Domain’s Postmaster Data with 250ok

In order to utilize 250ok’s Google Postmaster Tools integration feature, you will need to provision access to your domain with 250ok and provide a list of your domain(s) to have them enabled on your account.

To share access to your domain with 250ok:

  1. On your computer, sign in to Gmail Postmaster Tools
  2. Point your cursor on one of your verified domains
  3. To the right of the domain, click the “More⋮” (3 vertical dots)
  4. Click “Manage Users”
  5. At bottom-right, click “Add +”
  6. In the pop-up, enter the 250ok GPT alias ‘googlepmt@250ok.com‘ to add 250ok as an additional authorized GPT user with “read access” on your domain.
  7. After completing this step, it may take a few hours for 250ok to link your Postmaster Tools account and start collecting data. In the Settings & Instructions tab, your domain will be listed as “Pending Setup” until the point at which we start detecting data.

Note: As a domain owner, you can add or remove anyone who isn’t also an owner from your domain. If you want to remove someone from your domain who is an owner, however, you’ll need to remove their domain verification record in the DNS.

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