I am migrating from Kopano to Grommunio.
I have a customer who uses multiple domains. 1 is owned by him, the other two are accounts at 2 big german providers (one is t-online.de).
On Kopano I have setup sender_dependent_default_transport_maps, sender_dependent_relayhost_maps, smtp_sasl_password_maps and entries for each relayhost in master.cf on postfix. The entries in master.cf are needed because the biggest german provider t-online only uses port 465 with SSL (tls wrappermode enabled). The other servers use port 587 with STARTTLS.
The one domain owned by my customer could send directly without relayhost.
These files would always have to be edited on the command line on the server.
Grommunios GUI gives me the oppertunity to integrate the domains but I could not figure out how to enable different relayhosts for each domain.
Does this have to be done by editing the postfix config files like in Kopano?
Does Grommunio alter postfix config files?
e.g. if I change the postfix config files directly could it be that grommunio overrides my settings?
The website of Grommunio states that Grommunio can handle multi-tenant setups. I have not found anything in the documentation about this. Does a documentation exist for multi-tenant setups?
Thank you for your input