Doesn't suggest that though ...
It doesn't really suggest that it can't be used as that though, lon.winters301855. That and there's no definitive guide as to what is considered large volume anyway. There's been many suggestions by WA that it can be used to send out large amounts of emails, so if it can be set up to send 100 emails it can be set up to send 800. What you're talking about are restrictions imposed by the server and not a limitation of UE.
I've approached the people running the server to see what they have to say about it. Will report back then.