[exim] hubbed_hosts

Hello,

If I were to add 2 or more IPs belonging to the same domain in the
"hubbed_hosts" file like this (the IPs are remote smtp servers):

myhost.org:    11.22.33.44
myhost.org:    22.33.44.55

Would this mean exim would use the second IP if the first was
unavailable, or would it randomly choose one? If not is there a way to
enable this?

Thank you,
Jeroen