Emails are being tagged as malformed in InterScan Messaging Security

- Updated:
- 1 Feb 2021
- 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 mail 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

As a workaround follow these steps:

Add the following key into "/opt/trend/imss/config/imss.ini, under the section [MessageModule]:
LimitBytesPerEntityHeader=16777216

The new limit will be 16MB.
Use this command to restart:
/opt/trend/imss/script/S99IMSS restart

Rating:

Category:

Troubleshoot

Solution Id:

000267501

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