Configuring email router with specific homerealm

Hi,

I'm currently trying to configure an email router (UR12) under a claimbased/ifd installation on multiple ADFS servers. To make it works, I need to specify a homerealm, otherwise, it's my federated ADFS server who try to authenticate my user. We don't want to set authentication rules on our federated server. We have a seperate ADFS identity provider server wich do that. This is why I need to set my homerealm to this server, like we do to make outlook work. Is it possible to set this value somewhere ?

thanks!