[PERDITION-USERS] Chain perdition server

Hi all, I Would like to know if it's possible to chain perdition server between them. For example I have some server on my LAN who have to POP some gmail box. In order to secure the access I would like to install two perdition servers : the first one in the LAN and the second one in DMZ (Server->Perdition_LAN->Perdition_DMZ->Gmail server). I have successfully installed the server on the DMZ and it works, but when the one the LAN try to reach it, Ive got the following message : Perdition perdition.pop3[1461]: Fatal Error reading authentication information from client 128.240.99.227:57653->128.240.99.221:995: Exiting child I've got the same configuration on the two server except the outgoing_server, and I'm using POP3S with self signed certificate. Can you help me please ? Thanks ! Aurélien.