As a marketer, ensuring your emails reach inboxes reliably begins with strong sender authentication and secure transport. Email authentication protocols like SPF, DKIM, and DMARC help verify your identity and reduce the risk of spoofing. These protocols work together to signal to email providers that your messages are legitimate, which supports your sender reputation and improves deliverability.

Transport Layer Security (TLS) adds another layer of protection by encrypting email transmissions between servers. This prevents interception and ensures data integrity during delivery. While TLS doesn’t guarantee inbox placement, it’s widely expected by major email providers, including Gmail and Microsoft 365. Understanding how to verify, configure, and enforce TLS is essential for maintaining secure and reliable email sending practices.

This hub covers core aspects of email authentication and encryption, from basic setup to monitoring and troubleshooting. You’ll find guidance on verifying TLS status, configuring DNS records for authentication, and managing TLS settings across platforms like Mailchimp and Microsoft 365. The content also addresses how to validate encryption on third-party services and maintain compliance as requirements evolve.

What you'll find in this hub

  • SPF, DKIM, and DMARC fundamentals for email sender authentication
  • How to verify and enforce TLS encryption across email platforms
  • Best practices for TLS configuration in bulk email sending
  • Guides to test and monitor TLS status for sending infrastructure
  • TLS version comparisons and recommendations for current and future use
  • Integration tips for DNS settings with email verification and sending tools

Start here

Browse all 48 articles in Email authentication and encryption: SPF, DKIM, DMARC, TLS →

Put it to work

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