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254408@portlandschools.org: host aspmx.l.google.com[2607:f8b0:400e:c01::1b] said: 550-5.7.1 Your email was not delivered because it did not comply with the 550-5.7.1 Portland Public Schools email policies. Please review your message 550-5.7.1 and try again. Please note students can only email other Portland 550 5.7.1 Schools email addresses.. - gcdp o125-20020a62cd83000000b006d9b2675e34si3657682pfg.323 - gsmtp (in reply to end of DATA command)