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kumomta/docs/reference/headermap/set_content_transfer_encoding.md
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2025-10-07 07:38:10 +01:00

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# set_content_transfer_encoding
```lua
headers:set_content_transfer_encoding(VALUE)
```
{{since('2025.10.06-5ec871ab')}}
Assign the `VALUE` to the `Content-Transfer-Encoding` header.
`VALUE` may be either a `string` or be an [MimeParams](index.md#mimeparams).
If you assign using a string, the string will be parsed and validated as being
compatible with [MimeParams](index.md#mimeparams) before allowing the assigment to proceed.
!!! danger
Changing the `Content-Transfer-Encoding` header may result in an inconsistent
representation of the message and should be avoided. We recommend limiting
changes to just the parameter portion of the header rather than the overall
encoding.