Port 25 blocking problem

[Tom]

Hello all,

I have a client that when they arrived at their office today, no PC could
send email to the hosted mail server. They could receive mail just fine. I
had them telnet to the mail server on port 25 and no one could connect.
Everyone can telnet to port 110. The strange thing is that I can telnet to
tha mail server's
port 25 from my office. Somewhere, port 25 is being blocked from each PC to
the hosted mail server.

Does anyone know how of a diagnistic tool to see where port 25 is being
blocked? Can tracert be used for a specific port?

Thanks,

Tom

 

[Milly Staples [MVP - Outlook]]

You might want to post this to a server group or one for networking.
Outlook is not a part of this problem.

--
Milly Staples [MVP - Outlook]

Post all replies to the group to keep the discussion intact. Due to
the (insert latest virus name here) virus, all mail sent to my personal
account will be deleted without reading.

After furious head scratching, Tom asked:

| Hello all,
|
| I have a client that when they arrived at their office today, no PC
| could send email to the hosted mail server. They could receive mail
| just fine. I had them telnet to the mail server on port 25 and no one
| could connect. Everyone can telnet to port 110. The strange thing is
| that I can telnet to tha mail server's
| port 25 from my office. Somewhere, port 25 is being blocked from each
| PC to the hosted mail server.
|
| Does anyone know how of a diagnistic tool to see where port 25 is
| being blocked? Can tracert be used for a specific port?
|
| Thanks,
|
| Tom