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The Microsoft Connectivity Analyzer failed to test inbound SMTP mail flow.
Elapsed Time: 584 ms.
Attempting to retrieve DNS MX records for domain 'b.co.uk'.
One or more MX records were successfully retrieved from DNS.
MX Records Host remote.b.co.uk, Preference 5
Elapsed Time: 16 ms.
Testing Mail Exchanger remote.b.co.uk.
One or more SMTP tests failed for this Mail Exchanger.
Elapsed Time: 567 ms.
Attempting to resolve the host name remote.b.co.uk in DNS.
The host name resolved successfully.
IP addresses returned:
Elapsed Time: 353 ms.
Testing TCP port 25 on host remote.b.co.uk to ensure it's listening and open.
The port was opened successfully.
Banner received: 421 4.3.2 Service not available, closing transmission channel
Elapsed Time: 140 ms.
Analyzing SMTP Capabilities for server remote.b.co.uk:25
The test passed with some warnings encountered. Please expand the additional details.
Unabled to determine SMTP capabilities. Reason: Unexpected SMTP server response. Expected: 220, actual: 421, whole response: 421 4.3.2 Service not available, closing transmission channel
Elapsed Time: 38 ms.
Attempting to send a test email message to email@example.com using MX remote.b.co.uk.
Delivery of the test email message failed.
The server returned status code 421 - Service not available, closing transmission channel. The server response was: 4.3.2 Service not available, closing transmission channel
Message: Service not available, closing transmission channel. The server response was: 4.3.2 Service not available, closing transmission channel
at System.Net.Mail.SmtpConnection.GetConnection(ServicePoint servicePoint)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
Elapsed Time: 36 ms.
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