How Can We Help?
To help protect our users from unwanted or malicious email, our mail systems use spam filtering and reputation-based controls. Messages that appear suspicious may be marked as spam, delivered to a junk folder, temporarily deferred, or rejected entirely.
Our spam filtering systems evaluate a variety of factors when determining whether to accept a message. These may include:
- The sending server’s reputation and history
- Authentication results (SPF, DKIM, and DMARC)
- Message content and formatting
- Sending patterns and volumes
- User complaints and engagement metrics
A message may be blocked 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 ensure messages are accepted and delivered as intended.
If you operate a mail forwarding service, be aware that forwarded messages can inherit reputation issues from the original sender. Following email forwarding best practices and maintaining proper authentication can help improve deliverability and reduce the likelihood of messages being flagged or rejected.