We have SBS 4.5 running Exchange 5.5 connected via ISDN modem.
Today we installed a new router. The access to the Internet is OK, however
we are not able to send and received emails with Exchange. The ISP is
telling me that our port 25 is not open. I believe that the problem is
coming from the Proxy Server (incorporated within SBS 4.5), however it could
be the router or something else.
I have disabled the Dial-up features within IMS. Is this enough for the
server to retrieve the messages from our SMTP account?