Recently a few users had the following bounce backs from Office 365 to an On-Prem Mailserver with the error‘550 5.4.316 Message expired, connection refused(Socket error code 10061)Checking […]
Recently a few users had the following bounce backs from Office 365 to an On-Prem Mailserver with the error‘550 5.4.316 Message expired, connection refused(Socket error code 10061)Checking […]