SQL Server 2008 sp_send_dbMail fails to send to Exchange group in another domain

We have SQL Server installed in one domain and Exchange in another domain. We are using sp_send_dbMail to send notifications of a job failure. When we include direct email addresses, the emails are sent and received. When we email to an Exchange group, the emails are sent without any errors, but they are not received. We are specifying the address as: group@domain.net. The Exchange group is set for no message size limits and “From Everyone” for both users and groups. Of course the group works from Outlook. Could there be a setting Database Mail profile I missed?
WilliamsDigiSolSenior Systems SpecialistAsked:
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David ToddSenior DBACommented:

You need to dig into the actual error message, but my guess is that you may need to enable relaying on the exchange server for the server your SQL instance is on.


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WilliamsDigiSolSenior Systems SpecialistAuthor Commented:
Apparently we have a relay server, separate from Exchange, and had to have the, from, address added. You hit my problem on the nose.
WilliamsDigiSolSenior Systems SpecialistAuthor Commented:
Thanks for you help, you nailed our problem.
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Microsoft SQL Server 2008

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