In GW2012 I had two relay hosts configured for outbound messages. The IP addresses were separated by a space. Since the upgrade to GW2014, I can no longer add two relay hosts in the GWIA SMTP/MIME tab. When I add the second one, separated by a space, the admin console throws an error. The error says: "Internet address provided is invalid". According to the admin guide, it should still be possible.

How can I resolve this?