On 14 Aug 2015, at 11:22, Coert <lgro...@vlymskerp.net> wrote: > Hello all, > > I have a setup with about 10 FreeBSD and Linux VMs. (all running postfix) > > One of the VMs is the primary mail host. > All the other VMs I configured to use the primary as relayhost > And I aliased root in /etc/aliases on all VMs to an address on the primary. > > So far all the mail routing is working correctly, except that the from > addresses are: r...@fully.qualified.name.of.vm > So any bounces or replies from the primary mail server cannot be > delivered, because the VMs dont accept mail from 'outside'. > > Can I change the from address on each VM to something like: > rootVMname@myworking.domain? so that the domain name stays the same? > If so, where do I change this? > > Or should I create a domain on the primary mail server for each VMs > fully.qualified.name.of.vm and alias those to the same address they > currently send to?
What we do for this is the following, set in 'main.cf'; smtp_generic_maps = static:account+hostn...@example.com This maps all local addresses to a single account on the relay host; 'account' is the actual mailbox, 'hostname' the hostname of the VM that sends the message, and 'example.com' a local domain on the destination server. You only need one account this way, while still able to sort messages based on the VM they originate from, and all bounces, replies etc. will be sent to 'account', on the destination server, instead of returning to a box that does not accept SMTP connections. Works very well for 'null clients'; SMTP clients that only ever send mail, have no local mailboxes, and so on. Mvg, Joni
