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kumomta/docs/reference/header/message_id.md
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2025-10-07 07:38:10 +01:00

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# message_id
```lua
local message_id = header.message_id
```
{{since('2025.10.06-5ec871ab')}}
Reading the `message_id` field will attempt to interpret the contents
of the header as a `Message-Id` header.
If the header value is not compatible with this representation, a lua error
will be raised.