This article applies to:

• Trustwave MailMarshal (SEG)
• Exchange Server

Symptoms:

• MailMarshal scanning messages between Exchange Servers.
• Exchange meeting requests arrive as plain text and are not processed correctly at the receiving server.

Causes:

• MailMarshal message stamping can cause this issue.
• The issue does not occur with every combination of Exchange server versions.
• The issue is more likely to occur when messages are stamped at the top.

Resolution:

To resolve this issue, you can create a TextCensor rule to avoid stamping meeting requests.

• First create a TextCensor script to recognize the messages. For requests originating on Exchange Server 2007, you can create a script similar to the following:

Apply to: Message Body
For older versions with "special character" matching, enable matching of special characters.

• In the list enter : (the colon character)

Weighting Trigger Level: 25

Enter the following 5 items with weighting level 5, Standard weighting:

BEGIN:VCALENDAR
END:VCALENDAR
PRODID:Microsoft Exchange Server 2007
ORGANIZER
ATTENDEE

• Next create a rule that applies this script to skip message stamping. For instance, if you use a single rule to stamp messages, you can create a rule like the following:

When a message arrives
Where message is outgoing
Where message triggers text censor script(s) 'No stamp for meeting requests'
Pass the message on and skip the next rule

• Place this rule immediately before the message stamping rule.

To apply the change, commit configuration.