stat=Deferred: 452 4.5.3 Too many recipients (AS780090) From further research, it appears that Office 365 servers are picky with new servers, and they require them being run long enough to gain a good reputation. A lot of people complain a…

正規表現に `^FROM_DAEMON' とある場合、 (^(Mailing-List:|Precedence:.*(junk|bulk|list)|To: Multiple recipients of |(((Resent-)?(From|Sender)|X-Envelope-From):|>?From )([^>]*[^(.%@a-z0-9])?(Post(ma?(st(e?r)?|n)|office)|(send)?Mail(er)?|daemo…