J'attends encore de voir l'utilité et l'efficacité, j'ai de l'espoir, on pourrais en tirer du bon si c'est pour assister. En revanche je suis quasiment certain que ça vas être utilisé pour d'autres taches et que ce sont les demandeurs d'emplois qui vont en faire les frais…
Au moins c'est une boite d'IA française…
Full disclaimer : I've only ever used stalwart. Started with it and had no reason to change.
Been using it for about a year as a mail server for my services.
The set up is simple, configuration can be done through the webui or the conf files.
Creating users, mails, aliases etc is very straight forward.
Everything is pretty much painless, the documentation has almost everything you might need.
You can also configure automatic cert renewal. Something else I really like is that when you add a domain (you can have multiple) it also gives you the DNS configuration to add to your DNS server.
Honestly I'd say it's a solid choice. On my side it'll be part of futur projects where a mail server is needed.