Thanks, I am running dovecot as well and did not realize it could do that! I will do it that way!
I appreciate everyone else's help as well! Best Regards, Paul Richards Code Monkey/System Admin On Sat, May 19, 2018 at 12:26 PM, Wietse Venema <wie...@porcupine.org> wrote: > You appear to describe a system that delivers mail to two independent > message stores. The problem with that approach is that if a user > reads or deletes a message on one message store, then their action > will not change the state of the other message store. > > It is possible to do better than that. > > If you need a consistent view of multiple message stores, then you > need a replicated message store. Dovecot supports asynchronous > replication between a pair of master servers. You configure Postfix > to deliver mail to one of the two Dovecot instances (e.g., using > one DNS name with two A records, or random hostname selection with > the Postfix randmap feature), and the Dovecot instances talk to > each other. When one Dovecot instance is down, Postfix will deliver > to the instance that is available. > > > I understand how a MX relay works and how to implement it in postfix, but > > what I am looking to do is create a clone of all the mailboxes on our > > system to another system. So is one server setup like a MX backup relay > and > > then there is some switch or option that I don't know or do I just setup > > 'virtual_alias_maps' in main.cf on both systems to save a copy of the > email > > and forward it to the other? Will postfix be smart enough not to get > stuck > > in a loop? > > Two-way forwarding between MTAs is the definition of a mail forwarding > loop. Postfix breaks loops by looking at the hopcount_limit and at > Delivered_To: headers, and that results in a non-delivery notification > to the sender. So don't do that. > > Wietse >
