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1676928@fcpsschools.net: host mxa-0073b502.gslb.pphosted.com[205.220.177.87] said: 554 5.7.1 fcpsschools.net is a closed system. Emails can only be sent to or received from a limited number of approved external addresses. More information can be found on the FCPS website: https://www.fcps.edu/node/44350#-what-does-fcps-managed-environment-mean (in reply to end of DATA command)