If you send a large volume of emails to Gmail users, you can use Postmaster Tools to see:
- If users are marking your emails as spam
- How to prevent your emails from being blocked by Gmail
- Why your emails might not be delivered
- If your emails are being sent securely
Add & verify your Authentication Domains
An authentication domain is either the DKIM (d=) or SPF domain (Return-Path domain) that is used to authenticate your email. You can find it in the ‘Authentication Results’ header of an email that has successfully passed authentication (and was delivered to a Gmail mailbox).
For example, in the sample Authentication Results header below, domain.com is the ‘Authentication Domain.’:
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of bounce-123@domain.com designates 1.2.3.4 as permitted sender)
dkim=pass header.i=@domain.com;
DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; s=12345; d=domain.com;
Postmaster Tools uses your authentication domain to uniquely identify your email traffic and provide access to your traffic analytics.
Tip: Authentication domain can be either the domain-name or the sub-domain. If it’s a domain-name, the data will show the traffic aggregated over any and all sub-domains of that domain-name, plus any traffic corresponding to the (exact) domain-name match. You can also independently add multiple sub-domains and view data about each of them separately.
Add a domain:
- Go to postmaster.google.com.
- On the bottom-right, click the + button.
- In the box that pops up, enter your authentication domain.
- Next, prove that you own the domain by adding a DNS TXT or a DNS CNAME record.
Each account needs a separate DNS verification record, and you won’t be able to see your traffic analytics until you complete this step.