the idea… install hestiacp on a raspi and use it as a mail backup server. no mail should be sent from this server.
connect dyndns - done
rapsi system on hdd - done
hestiacp installed - done
set up mail server - done
set up port for mail - done
hestia accessible internally - works
hestia accessible externally - works
webmail accessible internally - doesn’t work
webmail accessible externally - doesn’t work
receive emails - doesn’t work
what have I forgotten? where am I making a mistake?