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Exchange 2013 Distribution Group Issues

I just migrated from Exchange 2007 to 2013.  The 2007 server has been decommissioned completely.  All is well except for the distribution groups... I can successfully email the groups from my outlook, but if a 3rd party application tries to email those groups the mail never gets delivered.  For example.....  I have Backup Exec 2014.  It is configured to email notifications when the backups are completed.... It is supposed to email a distribution group called ITGROUP.  It no longer works.  BUT, if I change the recipient address in backup exec to my email address it works.  So, it appears that the RELAY portion is working for individual email addresses, but not groups.  I am having this issue with multiple 3rd party applications when emailing to groups... And all of these notifications were working prior to the migration.

PLEASE HELP.
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BSModlin
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BSModlin
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Adam FarageEnterprise ArchCommented:
Its not a distribution group issue, its an issue with the relay on the server (this pointed it out below)..

I am having this issue with multiple 3rd party applications when emailing to groups... And all of these notifications were working prior to the migration.

I would recreate a separate Receive connector for your third party applications that require to relay, which (in Exchange 2013) can be done by following these instructions: http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/
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BSModlinAuthor Commented:
I have done this and still the same issues......

I have created a custom FRONTEND TRANSPORT receive connector.

Under AUTHENTICATION I have enabled ONLY TLS, and under PERMISSION GROUPS I have enabled ONLY ANONYMOUS USERS.

Under Receive mail from servers that have these remote IP addresses I have added ALL IP addresses of remote servers wanting to relay mail like Backup Exec server... Among others....

And finally, under Network Adapter Binding I have left the default:
(All available IPv4) Port 25

What am I missing?  And why does it work if I use a specific email address of one user, but not the group?
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BSModlinAuthor Commented:
So far no response.... please help....
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