How to use postmaster tools?

If you want to send a large volume of emails to Google email users, you can send it by using Postmaster Tools to see:

  • If Gmail users are marking your emails as spam.
  • Whether you’re following Google email’s best practices.
  • Why your emails might not be delivered to the recipient.
  • If your emails are being sent securely.
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How to add & verify your authentication domains

What’s an Authentication email Domain?

An authentication domain is either the DKIM (Domain Keys Identified Mail) (d=) or SPF domain (Return-Path domain) that is used to authenticate your email message. You can easily find it in the “Authentication Results” and the header of an email that has successfully passed authentication (and was delivered to a Google email mailbox).

For example, in the sample email Authentication Results header as shown below, is the ‘Authentication Domain.’:
spf=pass ( domain of designates as permitted email sender)
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=12345;;

Gmail Postmaster Tools uses your email authentication domain to uniquely identify your email traffic and provide full access to your traffic analytics.

Tip: Authentication email domain can be either the domain-name or the sub-domain. If it’s a web domain-name, the data will provide the traffic aggregated over any and all sub-domains of that authenticated web domain-name, and any traffic corresponding to the (exact) web domain-name match. You can also independently add multiple web sub-domains and view data about each of them separately when you need.

How to add a domain

  1. Sign in Gmail and Go to
  2. On the bottom-right corner of the Gmail, press the + button.
  3. In the box that pops up, click to enter your authentication web domain.
  4. On the Next step, prove that you own the web domain by adding a DNS TXT or a DNS CNAME record.

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