{"id":4140,"date":"2019-05-16T04:18:40","date_gmt":"2019-05-16T04:18:40","guid":{"rendered":"https:\/\/pariswells.com\/blog\/?p=4140"},"modified":"2019-05-16T04:18:40","modified_gmt":"2019-05-16T04:18:40","slug":"office-365-failed-550-5-4-316-message-expired-connection-refusedsocket-error-code-10061","status":"publish","type":"post","link":"https:\/\/pariswells.com\/blog\/research\/office-365-failed-550-5-4-316-message-expired-connection-refusedsocket-error-code-10061","title":{"rendered":"Office 365 Failed : 550 5.4.316 Message expired, connection refused(Socket error code 10061)"},"content":{"rendered":"<p>Recently a few users had the following bounce backs from Office 365 to an On-Prem Mailserver with the error<\/p><p><strong>&#8216;550 5.4.316 Message expired, connection refused(Socket error code 10061)<\/strong><\/p><p>Checking the logs in 365 of this, this was due to the Fortigate adding some 365 SMTP servers to the IPS Quantarine List<\/p><p>Removing these servers from the 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