Skip to content

SMTP MIME Header Issue – Wisenet Cameras

Created by: Alex Dias (a.dias@hanwha.com)
Created time: November 2025
Last edited time: November 2025
Product Category: Camera
Resolution Status: Planned
ZD KB Article URL: here

1. Issue

A MIME compliance issue has been identified on the PND-A9081RV when sending daily people-counting report emails.
The receiving mail server (Microsoft Office 365) blocks the email due to invalid MIME format.

Reported error messages:

  • INVALID HEADER: BAD MIME HEADER SECTION OR BAD MIME STRUCTURE

  • part did not end with expected boundary

  • unexpected end of parts before epilogue

Note: Standard alarm/test emails are not affected. Issue occurs only when the daily report is enabled.

2. Reproduction Summary

Testing performed using the latest firmware provided to the customer.

Camera Model Firmware Version SMTP Server Tested Result
PND-A9081RV v2.23.04_20250916_R190 Gmail  (SSL, Port 465) Success
PND-A9081RV v2.23.04_20250916_R190 Microsoft 365 / O365  (Port 587, STARTTLS) Blocked due to MIME rejection

Raw header analysis shows:

  • MIME boundaries are correctly closed

  • Structure is valid on Gmail

  • O365 rejects the email based on attachment MIME declaration

3. Root Cause

The daily report attachment (.xlsx) uses the generic MIME content type:

application/octet-stream

instead of the correct Excel MIME type:

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Strict filtering enforced by Office 365 identifies this mismatch as non-compliant and blocks the message.

4. Resolution Status

The MIME header generation for report attachments has been corrected by development.

  • The fix has already been implemented in a test firmware build.

  • The fix will be included in the next official firmware release.

  • Planned release schedule: End of November 2025 (per R&D feedback).

5. Affected Models

  • Confirmed impacted models (same MIME generation mechanism):

  • PNV-A9081R

  • PND-A9081RV

  • PNO-A9081R

  • PNB-A9001

  • PNB-A9011

    (Additional models using the same people-counting report mechanism may also be affected. Under review by HQ.)