The problem
Since update to new Core Version, I had to remove my "#notify" part from configuration.yaml. I had to reconfigure SMTP with the new integration. Plain email works (only text), but no HTML.
What version of Home Assistant Core has the issue?
core-2026.7.1
What was the last working version of Home Assistant Core?
core-2026.6.4
What type of installation are you running?
Home Assistant OS
Integration causing the issue
SMTP
Link to integration documentation on our website
https://www.home-assistant.io/integrations/smtp/
Diagnostics information
extra keys not allowed @ data['html']. Got None
Example YAML snippet
action: notify.send_message
target:
entity_id: notify.home_assistant_e_mail_notifier
data:
title: Home Assistant Warnung
message: Test Nachricht
html: >
<html>
<body>Hallo Welt</body>
</html>Anything in the logs that might be useful for us?
Nothing else, only: extra keys not allowed @ data['html']. Got None
Additional information
No response
The problem
Since update to new Core Version, I had to remove my "#notify" part from configuration.yaml. I had to reconfigure SMTP with the new integration. Plain email works (only text), but no HTML.
What version of Home Assistant Core has the issue?
core-2026.7.1
What was the last working version of Home Assistant Core?
core-2026.6.4
What type of installation are you running?
Home Assistant OS
Integration causing the issue
SMTP
Link to integration documentation on our website
https://www.home-assistant.io/integrations/smtp/
Diagnostics information
extra keys not allowed @ data['html']. Got None
Example YAML snippet
Anything in the logs that might be useful for us?
Additional information
No response