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mbonner
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Joined 5 years ago
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Sudden SMTP send failure to smtp.office365 dot com
We use BMC Track-It and we have it configured to send outbound emails to smtp.office365.com. This has worked since 2017. We use port 587 and SSL with authentication. The server runs Windows Server 2016. About a week ago, emails stopped sending. The email test button in Track-It results with -- Failure sending mail. [System.Net.Mail.SmtpException] -- Unable to read data from the transport connection: net_io_connectionclosed. [System.IO.IOException]. A Powershell test comes back with a similar result: : Unable to read data from the transport connection: net_io_connectionclosed. Wireshark shows success on Win10 and Server 2016 including this Track-It server: The server is fully patched. BMC and Microsoft seem stumped. Since this was working fine and stopped one day without explanation, I assume Microsoft changed something on the smtp.office365.com servers. Any ideas? Thanks!
