two days ago one of our applications was unable to send mail to the exchange server, could receive using pop3 but not send.
No changes were make i.e. patches etc, it just stopped.
1st test use outlook express to send and receive mail no problems.
2nd test telnet to port 25 error is as follows
Connecting To server1...Could not open connection to the host, on port 25: Connect failed
this is the answer on i would say 90% of the pc's but from the remainder i get what i would expect in that the server answers.
i have explicetly stated that the exchange can relay mail from our network 192.168.10.0 so there is nothing stopping it.
I have run the portqry tool so this is how i know it is a winsock error
when i run ethereal traces i see nothing
help would very much be appreciated.