How get mesage header References

[soromir]

Hello
I have a rcube_message_headers object obtained using hook messages_list.
The letter has a header attached to the photo.
But I can not get $ message-> get ('references'), although it is in the headers of the letter

[alec]

See show_additional_headers plugin for a way to add that additional header to the result. Not all message headers are fetched by default.