not sure if what I want is possible so I´d appreciate any pointers. I have full control over the infrastructure (DNS and servers)
Currently I receive mails for domain.tld. MX record for domain.tld is gw.domain.tld. gw then does some spam and virus checking and forwards the mails to the internal exchange server. GW is a Proxmox Mail Gateway Box (Free license)
Now what I want is to distribute mails for different recipients to other mail servers. Basicly I only want email@example.com and firstname.lastname@example.org to go to the exchange as before, but all others go to a different mail server (based on linux).
Any idea how I could achieve this?