How to deactivate the automatic correspondence to candidate after an agent referral ?

Summary

How to deactivate the automatic correspondence to candidate after an agent referral ?

Content

Hello,

We would like to deactivate the automatic correspondence that the candidate receives when an agent refers him.
We still would like to have the automatic correspondence that the candidate receives when a referrer refers him from the external/internal site.
I went over the Taleo message templates ,and it looks like the same message and event are used for the same type of refers - from an agent and the external/internal site.

Is it possible to have it deactivate  only for an agent ?

Thanks,