Can anyone help with this??
Biz-A (Exch 5.5 on NT4 and Private Addr Range 192.168.40.0) can send mail to Biz-B (Exch 2K on W2K and Private Addr Range 192.168.20.0) without any problems. Biz-B cannot send mail to Biz-A and one other company in Florida. Biz-A has a Firewall from which Biz-B gets their Internet access on a Secondary interface. Biz-B can’t ping anything on the Biz-A side of the FW, though Biz-A can ping to Biz-B.
I had my network vendor come in and check both locations and he says that the mail is never leaving the queue on Biz-B’s mail server. He did all the NS lookups and many other tests and could not find anything that would be preventing the mail flow. He suggested calling MS, and MS said to get the ping from Biz-B to Biz-A working, then call them back, the vendor insists that is not the problem. A few months back the mail was working between the two buildings, obviously something has changed, but I can’t seem to locate it. Any ideas? TIA!!