troubleshooting Question

How to deny user send to external email domain except one email domain

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Yalan asked on
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My client want to only allow theiremail domain send to (Partner company) user cannot email email to any other external address except

Transport Rule is set as below

Form a member of Distribution list
and send Delivery not authorized, message refused to sender with 5.7.1
except when the text "to" appears in a

Test results
1. User send an email to -- denied
2. User send an email to -- allowed
3. User send an email to and to - email sent out.

How to deny test result 3?
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