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Email delivery decisions are based on trust, authentication, and reputation.
Email isn’t blocked at random. Every message is evaluated using industry-standard authentication, sender reputation, and spam detection techniques designed to protect our customers from phishing, malware, and unwanted email.
Our mail systems use spam filtering and reputation-based controls to determine how each message should be handled. Depending on the results of these checks, a message may be delivered normally, placed in a junk folder, temporarily deferred, or rejected.
Our filtering systems evaluate multiple factors when determining whether to accept a message, including:
- The sending server’s reputation and history
- Authentication results (SPF, DKIM, and DMARC)
- Message content and formatting
- Sending patterns and volume
- User complaints and engagement metrics
A message may be blocked or filtered if it contains characteristics commonly associated with spam, or if the sending domain, IP address, or organization has a history of sending unwanted email.
Organizations that send email should follow established email authentication and sending best practices, maintain a positive sending reputation, and monitor delivery performance to improve reliability and ensure messages reach their intended recipients.
If you operate a mail forwarding service, be aware that forwarded messages can inherit reputation issues from the original sender. Proper authentication and recommended forwarding practices can help improve deliverability and reduce the likelihood of messages being flagged or rejected.
The best way to prevent blocked messages is to establish trust.
Maintain proper authentication, monitor sending reputation, and follow email best practices to improve deliverability.