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CaptainGibletsFlag for United Kingdom of Great Britain and Northern Ireland

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Cant send external email to exchange contact

I am creating a mail enabled list in sharepoint which creates a contact in exchange. I have done this for several lists without issue.
Today I have created a new contact via sharepoint and when I trying to send an email from external to the list my emails are failing on routing with the error message
"Fail"
LED=550 5.7.136 RESOLVER.RST.SenderNotAuthenticatedForRecipient; authentication required; Delivery restriction check failed because the sender was not authenticated when sending to this recipient
Now I know I need to set permissions for distribution groups but there is no such option for contacts that I can see.
Internal users can send emails without issue.
I have tried looking through a working contact and this one but I cant see anything. Hopefully its something with me being stupid and missing something obvious. Does anyone have any ideas what could cause this?
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Shaun Hardneck
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which version of exchange are you using , below screens shot if for Exchange 2013 and remove the option Require that all senders be authenticated and your issue will be resolved.

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ASKER

We are using Exchange 2016. There is no option for users to be Authenticated under contact, there is for distribution groups but not for contacts.
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Shaun Hardneck
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