SMTP & InfrastructureA missing PTR record triggers Outlook to reject your mail with a 550 error. This guide explains what reverse DNS is, why mailbox providers check it, and how to configure forward-confirmed reverse DNS for your sending IP.
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Email SecurityCAN-SPAM, GDPR, and CASL govern commercial email in the U.S., EU, and Canada respectively—and they have very different consent requirements. Here's what each law demands and how to stay compliant with all three.
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Email AuthenticationMoving to DMARC p=reject protects your domain from spoofing—but rushing the rollout can silently block legitimate mail. This phased guide takes you from p=none to full enforcement safely.
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DeliverabilityMost deliverability problems share the same root causes: broken authentication, a damaged sender reputation, or poor list hygiene. Here's how to diagnose and fix each one.
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