Gmail administrators should set up email authentication to protect their organization's email. Authentication helps prevent messages from your organization from being marked as spam. It also prevents spammers from impersonating your domain or organization in spoofing and phishing emails.
If spammers send forged messages using your organization's name or domain, people who get these messages might report them as spam. This means legitimate messages from your organization might also be marked as spam. Over time, your organization's internet reputation can be negatively affected.
Email authentication requirements for sending to Gmail accounts
Google performs checks on messages sent to Gmail accounts to verify messages are authenticated. To help ensure these messages are delivered as expected, set up email authentication for your domain. We recommend you always set up SPF and DKIM to protect your organization’s email, and to meet the authentication requirements described in Email sender guidelines. If you use an email service provider: Verify that your provider's authentication methods meet the requirements in Email sender guidelines. If you regularly forward email: Follow our Best practices for forwarding email to Gmail to help ensure messages are delivered as expected.
About email authentication
Set up standard email authentication methods for Gmail, and help ensure message delivery and prevent valid messages from being marked as spam. These videos describe how email authentication benefits your organization, and how to set up authentication.
Video: Why email authentication?
How email authentication benefits your organization & your users.
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Video: Set up email authentication
Learn how to set up email authentication for your organization.
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Set up email authentication for Gmail
First, ensure mail delivery & prevent spoofing with SPF
SPF lets you specify the servers and domains that are allowed to send email for your organization. When receiving mail servers get a message from your organization, they compare the sending server to your list of allowed servers. This lets receiving servers verify the message actually came from you.
Go to: Set up SPF to ensure mail delivery and prevent spoofing
Then, increase security for outgoing email with DKIM
DKIMs adds an encrypted digital signature to every message sent from your organization. Receiving mail servers use a public key to read the signature, and verify the message actually came from you. DKIM also prevents message content from being changed when the message is sent between servers.
Finally, enhance security for forged spam with DMARC
DMARC tells receiving servers what to do with messages from your organization when they don't pass either SPF or DKIM. DMARC also sends reports that tell you which messages pass or fail SPF and DKIM. These reports help you identify possible email attacks and other vulnerabilities.
Optionally, add your brand logo to DMARC-authenticated messages
After you set up DMARC, you can optionally turn on Brand Indicators for Message Identification (BIMI). When messages pass DMARC, email clients that support BIMI, including Gmail, display your verified brand logo in the inbox avatar slot. Learn more about the benefits of BIMI, and how it works.
