[exim] Some relay hosts

Hello,

I've some exim servers and I want to use 3 relay hosts to send all email
through them.
I know that I've to use "interface" option in remote_smtp, but can I set in
this directive a hostname that resolves to those 3 IP? Will exim do a round
robin connection for them?

Thanks!

Regards,
Alvaro Marin.