Hi. I recently installed an Exchange 2010 server in my Exchange 2003 organization. I only have those two servers. I moved some of the mailboxes on the legacy server to the new one. The thing is I can only send e-mail to external recipients: I can’t send mail from a user on one server to the other. I have checked the integrated authentication checkbox (and all others for that matter), which seems to be the case most of the time. The two servers communicate by means of a VPN between two Cisco ASA appliances. Strangely enough, I can telnet to port 25 and EHLO successfully each server from an Ubuntu laptop, but with a telnet from one server to the other (and even a Windows laptop), a EHLO get an “Unrecognized command” error. I just don’t get it. Help, please!!!
