Yes, especially since this sounds like a government agency. Some contractor snuck a backdoor into your email servers and is secretly reading them? Imagine what kind of corrupt practices, up to and including foreign espionage, that they could get up to. They could have been justified in sending in the FBI or CIA if this was the US. Probably would have put a stop to their vendor problems really quick.
I don't need to imagine anything, it's just another day in the Belpaese: https://en.wikipedia.org/wiki/SISMI-Telecom_scandal