550 5.7.1 Client does not have permission to send as this sender

From: "Roberto Scavino [1008815]" <rscavino@xxxxxxxxxxx>
Date: Fri, 4 Jan 2008 11:55:09 +0100

Exchange 2007 SP1

When a user (member of Domain Users group) is trying to send a message from
any kind of client application (Outlook 2007, Microsoft Mail, etc) using
SMTP, the error "550 5.7.1 Client does not have permission to send as this
sender" is returned. If the user become a member of Domain Admins group the
SMTP message is accepted and delivered without problems.
No problems at all sending messagies using RPC over HTTP or MAPI...
Any suggestions ?

Tnx,
Roberto
.

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