Interchange Status Codes 1203 - Error: Mailbag Error

Modified on Thu, Sep 11, 2025 at 11:34 AM

Interconnected Tier 1 EDI VANs use a secure mailbag wrapping protocol that allows advanced mailbag level tracking and control. 

The X12.56 mailbag ECGrid received from the sending VAN failed validation and was not processed. 


Recommended Action: The original sending VAN will need to review and correct any structural mailbag or interchange issues and resend.



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