Essentials Mail

Hello,
I am using BungeeCord on my server, ColoradoCraft (Successor to NationCraft), and am using essentials mail. Now, if a person in the PVP server sends mail to a person in the Creative server, how do i set up essentials mail so that the person in Creative doesn't have to go to the PVP server to get his mail, thus defeating the purpose?

Thanks in advance!