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cb77879@students.hcde.org: host ASPMX.L.GOOGLE.com[142.251.178.27] said: 550-5.7.1 Your email was rejected because your domain is not approved for 550 5.7.1 communication with Hamilton County Gmail accounts. - gcdp ck18-20020a05690218d200b00dbe9ef59608si3597588ybb.593 - gsmtp (in reply to end of DATA command)