I manage an exchange server 2010 The company that handles our faxes forwards them to us via email. Recently they told me we have a restriction set on our server and couldn't forward them to us. So I checked The exchange management console. There are no:
1) Hub transport rules
2)mailbox restrictions for the specific user account
3)quota limits or message size limit restrictions
The only other place I thought to check was the exchange management shell. But I'm not seeing in there where any restrictions or blocked users/domains are that pertain to the fax company. What command should I be typing in the shell to check for sender restrictions. And, have I checked all the correct locations for sender or mailbox restrictions.
Below is the telnet from their mail server to ours.
[11:49:16][firstname.lastname@example.org ~]$ telnet xxxx.xxxxxa.com 25
Connected to xxxx.xxxxx.com.
Escape character is '^]'.
220 xxxx.xxxxxx.com Microsoft ESMTP MAIL Service ready at Tue, 1 Oct 2013 12:50:24 -0600
250-xxxx.xxxxxx.com Hello [xxx.xxx.xx.xxx]
MAIL FROM: email@example.com
250 2.1.0 Sender OK
RCPT TO: firstname.lastname@example.org
250 2.1.5 Recipient OK
354 Start mail input; end with <CRLF>.<CRLF>
This is a test message from xxxxxxx.
554 5.1.0 Sender denied
500 5.3.3 Unrecognized command
they used to send to the mailbox all the time now they are saying a restriction is on our side. They can send to other boxes on our server. And, The mail server sends and receives emails from all other approved domains and senders