Delivery failed to distribution groups

Hi,
Recently we installed Exchange 2010.
I set Support distribution group and in Mail flow settings->Message Delivery Restrictions I set All senders and uncheck “Require that all senders are authenticated checkbox.” Nevertheless, when I send message from my Gmail account I get the following error:
550 Recipient addresses rejected: Relaying denied (state 14).
The internal users can post mail to this group.
levkiperAsked:
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MegaNuk3Commented:
Does the Support DG contain any external contacts?
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fr0nt242Commented:
If you check again the “Require that all senders are authenticated" checkbox can you send mail to this distribution group?
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levkiperAuthor Commented:
1.Support distribution group has the valid support@domain.com address.Is it what you mean when say external contact?
2.Checking “Require that all senders are authenticated" didn't help.
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fr0nt242Commented:
I forgot to tell you that this option prevents external senders from sending messages to distribution groups.
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Muzafar MominCommented:
can you post the full bounce back error
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MegaNuk3Commented:
1.) no, I mean does the DG contain any contacts or are they all mailboxes?
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levkiperAuthor Commented:
To MegaNuk3 :
Support DG and all other DGs contan mailboxes only (Valid users in DC ) and not contacts.
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MegaNuk3Commented:
Do you have any AV or spam filtering that external messages go through? You might need to add the DG email address into the recipient whitelist.
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Dan ArseneauDevOps EngineerCommented:
"550 Recipient addresses rejected: Relaying denied (state 14)"

It says right in the error that it's a Relaying issue.  Are you sending to a domain that may have an MX record pointing to the inside but is not listed in your "Accepted Domains" list.
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