Results from testexchangeconnectivity.com
Testing inbound SMTP mail flow for domain (censored).
ExRCA failed to test inbound SMTP mail flow.
Test Steps
Attempting to retrieve DNS MX records for domain [censored].
One or more MX records were successfully retrieved from DNS.
Additional Details
MX Records Host [censored]-com0i.mail.eo.outlook.com, Preference 0
Testing Mail Exchanger [censored]-com0i.mail.eo.outlook.com.
One or more SMTP tests failed for this Mail Exchanger.
Test Steps
Attempting to resolve the host name [censored]-com0i.mail.eo.outlook.com in DNS.
The host name resolved successfully.
Additional Details
Testing TCP port 25 on host [censored]-com0i.mail.eo.outlook.com to ensure it's listening and open.
The port was opened successfully.
Additional Details
Attempting to send a test e-mail message to [censored] using MX [censored]-com0i.mail.eo.outlook.com.
Delivery of the test message failed.
Additional Details
The server returned status code 550 - Mailbox unavailable. The server response was: 5.4.1 Relay Access Denied
Exception details:
Message: Mailbox unavailable. The server response was: 5.4.1 Relay Access Denied
Type: System.Net.Mail.SmtpFailedRecipientException
Stack trace:
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, Boolean allowUnicode, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)
at Microsoft.Exchange.Tools.ExRca.Tests.SmtpMessageTest.PerformTestReally()