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Database Mail Can't Send Externally Through Exchange 2010

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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Acosta Technology Services
Asked:
Acosta Technology Services
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1 Solution
 
pmorton23Commented:
check your from address and make sure it is from @yourdomain.com
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Acosta Technology ServicesAuthor Commented:
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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PudgleyCommented:
Sounds like either authentication issues or you need to setup a secure relay connector for that server

When I have had to deal with it  - relaying notifications from a SQL server, I was brought in when it wasnt working. I removed and started over using the maintenance wizard in SQL and it fixed it. I tried setting up the relay connector first so I have done the process but it wasnt necessary - i removed it

I dont know that your relaying sql notifications i am just giving you my experience with it.

heres an article on setting up the connector
http://exchangeserverpro.com/how-to-configure-a-relay-connector-for-exchange-server-2010
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Acosta Technology ServicesAuthor Commented:
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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