Trying to send mail to Exchange 2010/ SBS2011 server

Posted on 2012-09-06
Last Modified: 2012-09-21

I have Exchange working correctly for  I added a new e-mail address ( to one of the exisiting users.  At the registrar, I have the domain name pointing to my server.  The error I am getting is:

The original message was received at Thu, 6 Sep 2012 12:40:16 -0400 from []

   ----- The following addresses had permanent fatal errors ----- <>
    (reason: 550 5.7.1 Unable to relay)

   ----- Transcript of session follows ----- ... while talking to
>>> DATA
<<< 550 5.7.1 Unable to relay
550 5.1.1 <>... User unknown <<< 503 5.5.2 Need rcpt command

Do I need to add to my SAN Cert?

By the way, is receiving mail.

Thanks in advance for your help!

Question by:gemccllc
    LVL 77

    Accepted Solution


    Author Comment

    Do you mean e-mail addresses with subdomains or subdomains in general?  If the latter, isn't remote., autodiscover. subdomains?

    Thanks in advance for your response.
    LVL 77

    Expert Comment

    by:Rob Williams
    subdomains in general.

    Keep in mind is not using a sub-domain, it is a FQDN or host record., though some ISP's seems to refer to them as subdomains.  would be the FQDN of a subdomain.

    Having said that it is possible to recive mail, as per the link, for  and

    Author Comment

    OK, I got one working except when I go to to test outbound SMTP, it is saying:

    Attempting to find the SPF record using a DNS TEXT record query.
    ExRCA wasn't able to find the SPF record.
    Additional Details
    No records were found.

    Under which domain name do I place the record?  What exactly should it say?

    Thanks again.
    LVL 77

    Expert Comment

    by:Rob Williams
    Third Tier have bloged about creating SPF records for an SBS environment.

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