Experts this is actually a Exchange related question, but I suspect it will best be answered here.
I am attempting to telnet to a mail server located at 188.8.131.52 The connection is either accepted or not accepted. I have no affliation with the destination email server, all that I do know is that 2 of 3 unrelated sites I maintain cannot send email successfully to it.
So far I have not been able to precisely narrow down the root cause of why the connection is not accepted.
I have been able to eliminate an ISP/ route issue (I can connect from certain machines; the issue spans 3 different ISPs)
I think I have been able to eliminate telnet protocol issues (I can connect from one exchange 2007 SP2, but not another)
I have also tried different ISPs, and different networks with mixed results.
examples:(for testing purposes I have set my global outs the same for each test)
If it helps he 3 sites share a commonality in Firewall and antivirus products.
Site A/ ISP A
Server A: WinSBS2008- No success (exchange)
Server B Win2003 standard- Success
Server C: Win2003 standard- Success
Site B/ ISP A
ServerA: WinSBS2008- Success (exchange)
ServerB: Win2003 standard- Success
Site C/ ISP B
ServerA: Win2008/Exchange2007- No Success
WorkstationA: Windows 7- No Success
ServerB: Windows 2003 standard- Success
Any help appreciated