Does feel a bit like the Support category, we generally designed the reply via email feature for top posting.
In you are going for an interleaved reply try:
Coucou,
> C'est quoi DIG ?
Un outil pour faire des requêtes DNS. Un exemple d'utilisation :
https://www.bortzmeyer.org/dns-code-postal-lonlat.html
I would recommend avoiding signing as well cause we will not strip that and it can cause noise on the web interface.