Hello, Thanks to the documentation https://orgmode.org/worg/exporters/koma-letter-export.html I have succeeded to export in scrlttr2 class.
Thanks to this lco files, https://tex.stackexchange.com/questions/63085/adding-sectioning-support-in-scrlttr2-class it is also possible to get sections in a letter with scrlttr2 class. Nevertheless, I have to write the latex code \section{} and I ignore how getting sections via org-mode for this class. Is it possible to get an org-mode translation for section in this class? Another problem is the bibiography . I am a fan of org-ref (many thanks again to John Kitchin) and I would be happy to use org-ref in a letter with scrlttr2 class. My goal is to be able to write emails in gnus and org-mode and optionally to export the content of the email in a nice letter to attach it. I guess that it is possible, but I need help. Your help would be very welcome. Best wishes, -- Joseph Vidal-Rosset