Problems with sending images using SMTP integration

I’ve read just about every Google search result on HA’s SMTP integration and sending images and I still am failing.

I have the following in my configuration.yaml file:

homeassistant:
  allowlist_external_dirs:
    - "/config/media"


notify:
  - platform: smtp
    name: "family_sms"
    server: "░░░░░░.░░░░░░░░░.com"
    port: 465
    encryption: tls
    username: !secret smtp_user
    password: !secret smtp_pass
    sender: "░░░░░░░░░░░@░░░░░░░░.net"
    sender_name: Home Assistant
    recipient:
      - "░░░░░░░░░@░░░░░░░░░.com"
      - "░░░░░░░@░░░░░░.net"

My STMP recipients are an email address and a MMS recipient via email forwarder.

And this in my test automation:

alias: Camera Detection Test
description: ""
triggers: []
conditions: []
actions:
  - action: camera.snapshot
    metadata: {}
    data:
      filename: /config/media/temp4.jpg
    target:
      entity_id: camera.ai_pro_driveway_high_resolution_channel
  - action: notify.family_sms
    metadata: {}
    data:
      message: test
      title: sms test
      data:
        image:
          - /config/media/temp4.jpg
        html: |
          <img src="cid:temp4.jpg">
mode: single

By selecting “run actions” on my test automation, I’ve verified that the snapshot is actually being created:
Image may be NSFW.
Clik here to view.

and I can view it locally:

Image may be NSFW.
Clik here to view.

I am receiving both the email and MMS message but without the image! The email just show a broken image icon, and the MMS message just has the subject/title and the message text.

Above is the in-line image test, but I have tried sending it as an attachment by removing the two lines

        html: |
          <img src="cid:temp4.jpg">

from the automation. Results were the same. I guess it needs to be said that I also verified that I can send an email to the SMS/MMS forwarder with a picture as an attachment, or as an in-line image and successfully by using my email program. HA Core logs do not show any errors from executing the automation.

Can anyone give me an idea where to look for additional clues as to why this is not working? Thanks.

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