Group Email Created

I created a group. Assigned it email; added members. When internally I sent mail to the group - it works. When I send email externally I get the following error:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 5.1.1 User unknown (state 14).
Starquest321Asked:
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neothwinCommented:
On the group email property, pls remove require authentication for sender.
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neothwinCommented:
Properties of the distribution group \ Mail Flow Settings tab \ Message Delivery Restrictions
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