Saludos @MrE
Multidomains is possible wih NethServer, at least for mail…
Add in additional maildomains in NethServers Cockpit under Email → Domains
For all additional Domains, you’ll need external DNS entries (mail.domain2.tld) for the maildomain and Mailserver, but also MX entries and needewd stuff for DKIM etc. Use your primary maildomain as example.
These additional maildomains will generally allow in and outgoing mail, as for all Maildomains. To stop incoming, you can redirect all the incoming to a noreply kind of account, set a mail rule to reply accordingly.
As all “incomng” for these “special” accounts are directed to a single mail account (Mailbox), it should be easy to set up a rule to clean this folder up…
Create the users for these domains as following:
User1@maildomain2.tld → user1_domain2-shortform
(the full account for mail being user1_domain2-shortform@maildomain2.tld)
Use the Address option to set the correct external addresses.
I have described this in detail before (In reply to user capote), but can’t remember / find the original post…
Hope this helps
My 2 cents
Andy