Exchange 2010 Test Setup SMTP Problem

Hi,

I have setup a test Exchange 2010 Domain as we are looking to move from Exchange 2003
in the future.  It has its own DC and is plugged directly into a Router with forwarding on port 25.

After the intial setup I can send emails but I do not receive any from external sources.

I have setup a "Internet Receive Connector" using the Exchange Server IP address and
selected "Anonymous" only for the permissions groups.

When I telnet into the server from "external and internal" on port 25 I receive the
following

_________________________________________________________________________________________________

220 EXCHANGETEST01.*******.CO.UK Microsoft ESMTP MAIL Service ready at Sat, 31 Mar
2012 07:22:49 +0100
HELO
421 4.4.1 Connection timed out


Connection to host lost.

_________________________________________________________________________________________________

The connection is open "until" I try to type any commands which causes it to disconnect immediatly.


Any help appreciated

Regards