Voicemails sent from Cisco Unity go to Outlook junk folder

Some of our voicemails sent from Cisco Unity go to the Outlook junk folder.  

The sender address format is "john@acme-cuc01".  Outlook will not allow this address to be added to the safe senders list.
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Simon Butler (Sembee)Connect With a Mentor ConsultantCommented:
If the transport rule sets the SCL value to -1 that basically tells the client it is not spam.
To setup the rule, go through the transport rule wizard, choosing the option to specify the SCL value an enter -1.

Which versions of Exchange and Outlook are you on?  We're looking into a similar problem with Unity Connection, and Exchange 2013/Outlook 2013.

From looking into this, we believe that Exchange 2013 will not accept email addresses without two parts in the SMTP domain name (i.e. acme-cuc01 will not be recognised, but acme-cuc01.local would be fine).  We're looking to change UC's SMTP domain name format, then set the UC domain as an accepted domain in Exchange and add its email address format to our email address policy.
roosterupAuthor Commented:
We are using exchange 2010 and various versions of outlook.
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Simon Butler (Sembee)ConsultantCommented:
Use a transport rules to set the SCL value for emails from that source to -1.

roosterupAuthor Commented:
Hi Simon. Exactly how do I use a transport rule to set the SCL value?
roosterupAuthor Commented:
Will a transport rule be honored by MS Outlook?
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