Hello, I have just installed an additional Exchange Server 2007 to my existing 4 E2k7 environment. The new server is connected by VPN WAN. Emails flow between the servers OK for small sized emails. Larger sized emails of around 10-30MB in size continuously receive Connection Dropped Error 421 4.4.2. The WAN is about 256K speed and can be unreliable at times. Are there fine tuning settings for the time outs in the receive connector? or anything else that may cause this problem? Thanks.