set_content_transfer_encoding

headers:set_content_transfer_encoding(VALUE)

Since: Version 2025.10.06-5ec871ab

The functionality described in this section requires version 2025.10.06-5ec871ab of KumoMTA, or a more recent version.

Assign the VALUE to the Content-Transfer-Encoding header.

VALUE may be either a string or be an MimeParams.

If you assign using a string, the string will be parsed and validated as being compatible with 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.