[Rumierules]

I think the Moose is saying, "we can't communicate by email."

Of course they can.

They are trying to get the sniper to communicate in a manner that is more likely to reveal his identity or location.

[lelio]

Then email's the way to go. The sniper might be able to send off email (bounce it off an open relay) but there would be no way for him to receive it without being traced.
The sniper could ask for a less public way of communicating, like putting ads in the local paper. Sort of like those "thank you st jude" ones but with a coded message.

[KevinB]

They are trying to get the sniper to communicate in a manner that is more likely to reveal his identity or location.

Disagree. They can determine exactly where his computer is from email communications.