How to stop block recipient suggestions in Send Report by Email

[aardvark]

I am looking for a way to block the name suggestions when using "Send Report by Email" as it leaks user names from across all projects. (We don't actually store the email addresses, so this cannot be used to send emails across project boundaries.) 

I would be happy just requiring the sender to always supply the complete email address (e.g. "who@where.com") rather than having the To field prompt with the full name (e.g. "Doctor Who" when I type "Do") when I might not even have known Doctor Who existed, and when Doctor Who is not in my project.

Is there a config setting for this?

Using Cognos 11.1