Because of Exchange Server limitations, CodeTwo Exchange Rules 2007, CodeTwo Exchange Rules 2010 and CodeTwo Exchange Rules PRO do not split messages. I.e. if you exclude internal users from the scope of recipients for a particular rule and send a message addressed to multiple recipients (external and internal users at the same time), all recipients will receive a message with a disclaimer / signature.

You can change this algorithm by enabling a message splitting option in the advanced options of CodeTwo Exchange Rules 2007 2.x and CodeTwo Exchange Rules 2010 or in the CodeTwo Exchange Rules PRO settings.

In CodeTwo Exchange Rules 2007/2010 open CodeTwo Exchange Rules Administration panel, click Tools and select Advanced settings. In the resulting dialog box select Split messages addressed to multiple recipients if you want different rules to apply to different recipients option (Fig.1).

Fig. 1. Advanced settings - splitting messages

In CodeTwo Exchange Rules PRO open CodeTwo Exchange Rules Administration panel, click Setting button in the main window. In the new window click Message Splitting tab and select Split messages addressed to multiple recipients if you want different rules to apply to different recipients option (Fig.2).

Fig.2. Settings - Message Splitting tab.

From now on, all recipients will be divided into groups according to the rules corresponding to them. Thus the same set of rules will be assigned to each group of the recipients. Next, CodeTwo Exchange Rules divides a message into as many copies as many groups of recipients it has created. Then, each message is processed according to the rule it corresponds to.

Example:

There are 3 rules named Rule1, Rule2, Rule3. A single message is sent to 6 addressees: A1, A2, A3 , A4, A5, A6. CodeTwo Exchange rules scans the message and divides it in the following way:

In this case, the program will divide all recipients into 4 groups, thus it will send 4 following copies:

1st copy will be sent to (A1, A2) who use Rule1
2nd copy will go to (A3, A4) who use Rule 2
3rd copy will be sent to (A5) who uses Rule1 and Rule2
4th copy will be sent to (A6) who does not match any criteria

Please bear in mind that the envelope of this particular e-mail will not be changed. In other words, all copies in a TO: field will have the same value A1, A2, A3, A4, A5, A6. A mail body, on the other hand, will look differently for each of the copies since it will be modified by different rules.

See also:

Split messages not visible in OWA 2010 Sent Items folder