Email spoofing security is an imperative addition to your email’s security posture, here’s why. Email spoofing is a form of internet fraud. Leverage email authentication tools to enhance your domain’s email spoofing security.

Starting May 5, 2025, Microsoft enforces strict sender requirements. Emails from domains sending over 5,000 messages per day must pass SPF, DKIM, and DMARC checks.—or face the 550 5.7.15 Access Denied error.

Learn how to set up SPF, DKIM, and DMARC for Customer.io to boost email deliverability and protect your domain from spoofing.