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Knowledge Base & Operational DocumentationHow to Diagnose Business Email Rejections Caused by Attachment Types
11/10/2026
Email gateways may reject certain file types or containers even when the message size is within limits.
Checks to make
Capture the non-sensitive rejection notice, compare delivery with a permitted test file, and check sender and recipient policies. Use an approved secure file-sharing method for blocked content rather than renaming a file to bypass security controls.
When to get help
Email operations support can identify policy-based rejection and safe alternatives. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.