Hello, "ox-koma-letter" is an export back-end living in contrib, which, as you may know, allows to easily produce letters from Org. I think this is a nice feature to have[fn:1]. Should we have it in core?
There is one thing to consider, though: Viktor Rosenfeld (Cc'ed) contributed a significant number of lines of code to the file but hasn't signed FSF papers, AFAIK. WDYT? Regards, [fn:1] Luis Anaya's ox-groff.el seems to provide similar features but I haven't tested it. Though, AFAICS, Groff is more limited than LaTeX. -- Nicolas Goaziou