Issue Receiving MDN Test Messages – SMTP MT Test 39 (Disposition-Notification Header)

[Pranav Kulkarni]

Hi,

Description:

We are currently performing Direct Messaging certification testing using the ETT tool and are encountering an issue with receiving messages for the MDN header validation test.

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Test Case Details:

• Test: SMTP MT Test 39 (Message with Good Header)

• Direct Address: fh...@fhir.spryhealth.care

• Vendor Hostname: mail.fhir.spryhealth.care

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Issue Observed:

• When executing SMTP MT Test 39, the ETT tool shows:

  • “Email sent Successfully”

  • A valid Message-ID is generated

• However:

  • The message is not received on our SMTP server (Apache James)

  • No corresponding SMTP logs (MAIL FROM / RCPT TO / connection) are observed during the test

  • The message does not appear in the inbox for processing

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Working Scenario (For Comparison):

• When using “Send Direct Message” from the ETT tool:

  • Messages are successfully received

  • Processed correctly

  • MDNs are generated and sent back successfully

• This is also reflected in the Message Status section where:

  • Status shows MDN_RECEIVED

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Environment Details:

• SMTP Server: Apache James

• SMTP Port: 25 (publicly accessible)

• MX रिकॉर्ड:

  • fhir.spryhealth.care → mail.fhir.spryhealth.care

• DNS CERT record is correctly configured and validated

• External connectivity to SMTP is confirmed (accessible from external networks)

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Observations:

• No inbound SMTP connection is logged during SMTP MT Test 39 execution

• Indicates that the message may not be reaching our server at all

• Other Direct messages from ETT are successfully delivered, suggesting partial connectivity

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Request for Assistance:

Could you please help us verify:

1. Whether the message for SMTP MT Test 39 is being dispatched from ETT successfully?

2. If there are any delivery failures or routing issues on the ETT side?

3. Whether this test uses a different delivery mechanism or endpoint compared to “Send Direct Message”?

4. If there are any specific requirements (e.g., TLS, trust anchors, policy constraints) that could prevent delivery of this specific test message?

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Additional Information:

• We can provide timestamps and Message-IDs for correlation if needed

• Logs from our SMTP server show no incoming connection attempts for this test

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Attachments:

• Screenshot showing successful send (SMTP MT Test 39)

• Screenshot showing successful MDN processing for normal Direct messages

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Conclusion:

Our system is able to receive and process standard Direct messages successfully, but messages sent as part of the MDN header validation test (SMTP MT Test 39) are not reaching our server.

We would appreciate your guidance in identifying the root cause.

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Thanks & Regards,
Pranav Kulkarni

[Sai Valluripalli]

Your direct cert is missing SKI/AKI. Please correct it and try again.

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[Pranav Kulkarni]

The same issue is occurring again. We are able to receive Direct messages, but delivery notifications are not being received.