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Database Mail Can't Send Externally Through Exchange 2010

Medium Priority
Last Modified: 2012-05-11
This is the logged error shown in SQL when I try to send a test message from Database Mail:

The mail could not be sent to the recipients because of the mail server failure. (Sending Mail using Account 1 (2011-04-26T19:57:59). Exception Message: Cannot send mails to mail server. (Mailbox unavailable. The server response was: 5.7.1 Unable to relay).

This is the information from the receive connector I setup on the Exchange server:

Receive Connector:  SQL Connector
FQDN:  *servername*.domain.pvt
Use these local IP addresses:  "all available IPv4" Port 25
Receive mail from remote servers:  *IP address of SQL server
Authentication: Everything is checked except for "externally secured"
Permission Groups:  Everything is checked

Anything glaringly obvious I'm missing here?
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check your from address and make sure it is from @yourdomain.com
AaronVice President, Operations


In SQL the E-mail Address and Reply-To address are both from our domain (resident on the Exchange server); the @username and @password fields are "NULL".
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AaronVice President, Operations


The link you sent was perfect, I had to modify the permissions according to the article (in Exchange; SQL was good) and then the test mail immediately came through.
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