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message:append_text_html(content)

Since: Version 2024.06.10-84e84b89

The functionality described in this section requires version 2024.06.10-84e84b89 of KumoMTA, or a more recent version.

Identifies the primary text/html part of the message, decodes its transfer encoding, and locates the closing "</body>" or "</BODY>" tag. If the tag is found, content is inserted ahead of it. If no body tag is found, appends the content string to the part. The part is then re-transfer-encoded and the message data is updated.

This is useful for example to add a tracking pixel into the message:

umo.on('smtp_server_message_received', function(msg)
  local my_tracking_link =
    '<img src="http://10.0.0.1/img_tracker.jpg" alt="open tracking pixel">'
  msg:append_text_html(my_tracking_link)
end)