hope you are all good despite of this Covid context.
I have already 2 MAIB servers on 1 Provider hosted on Cloud Provider and it works very well.
However, at office i have my own little datacenter, my professional ISP (under Fiber) permits to personalize Reverse DNS, does not block SMTP protocol.
Of course my Public IP is fixed.
Starting today, DNS replication are effective, my reverse DNS is well set.
ping box.domain.tld gives correctly the public good addresse @IP
nslookup personal public @IP gives correctly box.domain.tld
My wish is to host at office one of my MAIB server hosted today on cloud Provider.
why ? Better maintenance without additinal costs, better privacy too (all is at office).
All conditions are there to proceed.
How could i set Ubuntu server, so that MIAB does not see internal @IP 192.168.x.x, but Public IP ?
Many thanks to all for your precious help that could guide to finalize this installation according my need and wish .