Prevent technicians to add new requesters via email

Prevent technicians to add new requesters via email

Hi
 
Currently, our technicians do not have the "Adding Requester" authority in their roles.
 
However if they send an email with a line similar to the following, a new obsolute requester is automatically added.
@@REQUESTER=anyobsoluteusername@@
 
If the defined requester name does not exist, I would prefer that line to be ignored and technician's name to be used as a requester.
 
Is there anyway that I can achieve this? We are using SDP+ 8.1.0 Build 8114
 
Best regards

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