malformed email

Issue:
I have IMSA 7.0 Patch 1. Recently, one of my email is quarantined which can be seen from the web console with the reason "malformed". I noticed from the mail, it has about ~70 image attachments which are the company logo/symbol in that particular mail. I believe that is the reason for the "malformed" issue.

Answer:

Malformed email is quarantined in IMSA due to the following rules setting:

1. Maximum number of entities allowed in each mail message ( usually Maximum attachment or embedded item)
LimitEntities = 64

2. Maximum number of parameters allowed in each header field ( You can change this field to CC and BCC field as well)
LimitHeaderParams=100

3. Maximum number of header fields allowed in each entity
LimitHeaders=500

You will have to edit this setting.

Access the hyperterminal console and log in as root. Locate the following imss.ini file located in /opt/trend/imss/config/ directory.
Change the value of the following parameters to the maximum value needed:
LimitEntities

References:
http://esupport.trendmicro.com/Pages/Frequently-Asked-Questions-FAQ-about-the-mail-transfer-agent-MTA-of-In.aspx
http://esupport.trendmicro.com/7/What-is-malformed-email-and-how-to-avoid-it.aspx