Been having a weird issue with Exchange recently where we would not receive e-mails from certain senders. I've used https://testconnectivity.microsoft.com and the only issue that pops up (that I can see) is this:
I've been trying to track down where and how to sort this out without much luck. Can anyone point me in the right direction please?Analyzing SMTP Capabilities for server mailserver.hattonacademy.org.uk:25
The test passed with some warnings encountered. Please expand the additional details.
Unabled to determine SMTP capabilities. Reason: Authentication failed to the SMTP server.
Elapsed Time: 338 ms.
When you say certain senders, do you mean certain domains or specific email addresses? Does the sender get an NDR (bounce back)?
Have you tried the delivery report checker in ECP to check to see if there's any trace of the email coming into your box? Alternatively you could enable logging on your receive connector, send an email from an address that seems to be blocked and see if there's anything recorded in there.
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