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SharePoint 2013 ULS error: Mailbox unavailable. The server response was: 5.7.1 Client does not have permissions to send as this sender
We encountered this error (Mailbox unavailable) while setting up the newsfeed notifications for SharePoint 2013. We solved this by creating a receive connector in Exchange 2010 with the following settings: Default information we added our SharePoint server IP’s Authentication settings And the following permissions groups. We have added the FQDN of the exchange server in […]

We encountered this error (Mailbox unavailable) while setting up the newsfeed notifications for SharePoint 2013. We solved this by creating a receive connector in Exchange 2010 with the following settings:

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Default information

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we added our SharePoint server IP’s

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Authentication settings

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And the following permissions groups.

We have added the FQDN of the exchange server in the outgoing mail settings for SharePoint.

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