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Emails are being tagged as malformed in InterScan Messaging Security

    • Updated:
    • 4 Sep 2020
    • Product/Version:
    • InterScan Messaging Security Suite 9.1
    • Interscan Messaging Security Virtual Appliance 9.1
    • Platform:
Summary

Email messages are detected as malformed and shows the following log entry:

2019/09/20 13:49:35 GMT-05:00	[22655:3077465808] Encounter malformed message, fall into exception handling. (9) 'TMMSG_ERR_C_INT_MUCH_BYTES_IN_ENTITYHEADER'

In IMSS, by default the email header size limitation is 65536 characters. The exception "TMMSG_ERR_C_INT_MUCH_BYTES_IN_ENTITYHEADER" indicates that the mail headers exceeded 65536 characters.

Details
Public

As a workaround follow these steps:

  1. Add the following key into "/opt/trend/imss/config/imss.ini, under the section [MessageModule]:

    LimitBytesPerEntityHeader=16777216

    The new limit will be 16MB.

  2. Use this command to restart:

    /opt/trend/imss/script/S99IMSS restart

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Rating:
Category:
Troubleshoot
Solution Id:
000267501
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