Hi
We just set up a new server 2012 standard r2 with exchange 2013, all brand new install and we can telnet to port 25 internally, but not externally. We have connected the server to 2 different firewalls and experience the same issue so it does not appear to be a firewall issue. Setting up smtp on port 26 appears to work, however port 25 is being blocked for some reason. The windows firewall is disabled.
any ideas would be appreciated.
thanks