On Wed, Apr 22, 2015 at 06:07:19PM +0800, Daniel Mare wrote: > We have an old Mac OS X mail server that we plan to replace with a new > Zimbra server, but we can't move all mailboxes over in one go, instead, > we plan to route all internet mail to our new Zimbra server, which has > the authoritative list of all users on the domain and can thus reject > non-existent recipients. > > Mail to valid recipients are then either delivered to the mailbox on the > Zimbra server itself, or passed on to the Mac OS X server for those > mailboxes still located there.
Sounds sensible. > The old Mac OS X server thus needs to be set up to accept all mail allegedly > on the domain and pass it on to the Zimbra server in case it doesn't know > about that particular user as explained here: > > https://wiki.zimbra.com/wiki/Split_Domain > > After reading through loads of postfix documentation, it seems like the > thing to do is to edit /etc/postfix/main.cf on the old Mac OS X server > and add in the following line before reloading postfix: > > fallback_transport = smtp:new.zimbra.server.com That setting is a feature of the local(8) delivery agent. It redirects mail addressed to non-existent login accounts when the domain is listed in mydestination, and no transport overrides select a transport other than "local". > Does above seem correct? Rather depends on how the MacOS/X server is configured. Do you plan to immediately delete the login accounts of non-existent users? Is the "local" transport even used? > Is anything else required to make it work? Does below need changing? > > local_recipient_maps = proxy:unix:passwd.byname $alias_maps That depends on whether the server is still a primary (or backup) MX host for the domain. Generally insufficient information. You are regaling us with stories, rather than posting facts. Facts are more actionable. Post your configuration, and explain the old and new mail routing designs. -- Viktor.
