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Allow Anonymous User to Relay Email via Exchange
Exchange Management Shell
Get-ReceiveConnector "Default Eaton" | Add-ADPermission -user 'NT Authority\Anonymous Logon' -extendedrights MS-Exch-SMTP-Accept-Any-Recipient
Exchange Management Shell
Get-ReceiveConnector "Default Eaton" | Add-ADPermission -user 'NT Authority\Anonymous Logon' -extendedrights MS-Exch-SMTP-Accept-Any-Recipient