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Exchange 2007 5.7.1 smtp


I got this rejection message. I am using Exchange 2007 SP3. What would this mean?

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.
Diagnostic information for administrators:
Generating server: mail.domain.com
#< #5.7.1> #SMTP#

2 Solutions
Malli BoppeCommented:
Is this an for an internal email or an external email.
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