[exim] How to queue mail this way..

Hello,

I just wanted to know how I could check if this is working the way I
think it does..

If a domain goes down, that I transport mail to, and I have 5-10 emails
in the queue for them. When the retry schedule comes around again to
send to them; What does exim do?

Does it connect once per email in the queue? (5-10 connections) or does
it make one connection and then send 5-10 emails over it?

Again I am talking about email going to a single host that I have
defined in my transports.

I would prefer it do the latter, but how can I check if this is really
what is happening?

Thanks in advance.