Can’t send emails outside my domain using Exchange 2007

1146240 pts.
Tags:
Microsoft Exchange 2007
SMTP
I'm currently able to send emails using the typical C# SMTP through Exchange 2007 (as long as the from / to are within my domain). But when I try to send them outside the domain, I get this error message:
Exception Details: System.Net.Mail.SmtpFailedRecipientException: Mailbox unavailable. The server response was: 5.7.1 Unable to relay
How can I get Exchange to accept my email and send it out?
1

Answer Wiki

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To send emails outside of your domain, you need to configure a new SMTP Send Connector.
Refer this article for how to configure a new SMTP Send Connector :

http://www.msexchange.org/articles-tutorials/exchange-server-2007/planning-architecture/Exchange-Server-2007-Email-Routing-Part2.html

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  • bobluis
    You need to allow annonymous smtp connections to send email from outside of your domain. Check this solution http://www.chicagotech.net/exchange/exch2010c.htm
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