I try send email using sharepoint 2013, but in the sharepoint site we get this error 5.7.1 Client was not authenticated
search errors in event viewer , i look this warning.
The account ‘DOMAIN\USERNAME’ provided valid credentials, but it does not have submit permissions on SMTP Receive connector ‘Default Frontend SRVVIREXC03’; failing authentication.
I use this power shell
Get-ReceiveConnector “Default Frontend SRVVIREXC03” | Add-ADPermission -User ‘DOMAIN\USERNAME’ -ExtendedRights ms-Exch-SMTP-Submit
After this powershell apply successfull emails send normally.