Unable to send messages externally but able to receive external email.
Microsoft Transport error message 1035
Inbound authentication failed with error logon denied for Receive connector
1. Windows Time - restarted (time on the server was out with almost 10minutes (restarted time servers on DC)
2. Investigate how email reach your exchange server
My firewall was setup to filter smtp traffic onto a specific leased line --> restarted primary Firecluster and the email flow from outside was re-established.
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