Friday, 4 February 2011

550 5.7.1 RESOLVER.RST.AuthRequired; authentication required

If you receive this message after sending mail to an Exchange 2007 Email distribution group then your Exchange Administrator needs to uncheck "Require that all senders are authenticated" from the Mail Flow Settings tab.
Start/All Programs/Microsoft Exchange Server 2007/Exchange Management Console/Recipient Configuration/Distribution Group/<Offending Distribution Group>/Properties/Mail Flow Settings/Message Delivery Restrictions(note: Double Click)

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