I have just installed a fresh copy of exchange 2010 and unable to receive external mail.
It is receiving internal mail and sending internal/external mail.
I can ping the mail server and telnet onto port 25.
I have created a new receive connector with the following settings: FQDN (mail.mydomainname.co.uk) - Local IP address (All available IPv4) (Port 25) - Remote server (mail server IP address) - Authentication (TLS) - Permissions (Anonymous, Exchage Users, Exchange Servers, Legacy Exchange).
When sending the email the sender receives the following bounce back
Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
The following organization rejected your message:
Anything I should be checking ?