I am having an issue with receiving on a newly installed Exchange 2010 server. I have checked all the normal things and cannot find where anything is wrong.
From some IP addresses I can telnet with no problem. And from others I cannot to port 25.
Below is the smtp test from mxtoolbox.com results.
220 Exchange-server Microsoft ESMTP MAIL Service ready at Wed, 26 Jun 2013 09:09:50 -0400 [811 ms]
250-Exchange-server Hello [22.214.171.124]
250-X-EXPS GSSAPI NTLM
250 XSHADOW [655 ms]
MAIL FROM: <email@example.com>
250 2.1.0 Sender OK [671 ms]
RCPT TO: <firstname.lastname@example.org>
550 5.7.1 Unable to relay [5663 ms]
SendSMTPCommand: You hung up on us after we connected. Please whitelist us. (connection lost)