Our Exchange 2013 Server has not received external email since around 5:00pm EST yesterday (7/10/2019). We are able to send/receive internally and also send external emails with success, but cannot receive.
I have tried restarting Exchange services and the server completely. I ran a test on https://testconnectivity.microsoft.com for Inbound SMTP email and this is the error it reports:
Analyzing SMTP Capabilities for server mail.jaxjetport.aero:25
The test passed with some warnings encountered. Please expand the additional details.
Unabled to determine SMTP capabilities. Reason: Unable to read data from the transport connection: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.
Elapsed Time: 61048 ms.
Attempting to send a test email message to firstname.lastname@example.org using MX mail.jaxjetport.aero. Delivery of the test email message failed.
The server returned status code -1 - The operation has timed out. Exception details: Message: The operation has timed out. Type: System.Net.Mail.SmtpException Stack trace: at System.Net.Mail.SmtpClient.Send(MailMessage message) at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally() Elapsed Time: 100017 ms.
I have also used the cmdlets Test-MailFlow and Test-SMTPConnectivity. All showing Success
No firewall changes were made in the time frame that we have been experiencing issues
UPDATE - I ran the cmdlet Test-MailFlow -TargetEmailAddress [my personal email address] and it returned with FAILURE