HEADER finding
Missing List-Unsubscribe header
The message has no List-Unsubscribe header. For bulk senders, Google and Yahoo require it since February 2024.
Finding code
missing_list_unsubscribe
This finding appears in the findings array of
the spam checker and
the POST /v1/sender API response when the
condition above is detected.
How to fix it
The fix.
Add List-Unsubscribe and List-Unsubscribe-Post headers to bulk and marketing messages. Google and Yahoo require them for senders above 5000 messages per day, and their absence increases the chance of landing in spam.
Related HEADER findings
Other things we check.
| Finding | What it means |
|---|---|
no_authentication_results
|
No Authentication-Results header |
missing_message_id
|
Missing Message-ID header |
missing_date_header
|
Missing Date header |