So, I have a mail server under MDaemon-om (400 users), which enjoys a central location in the company. Server is a virtual machine in the DMZ.
the company bought another MDaemon (400 users), it should be in another location and would be a backup mail server. on my DNS provider
I configured A record, MX record, and that's ok.
The internal network of the company I have a tool that synchronizes mailboxes and settings of the two servers.
Interested me what is your experience in configuring a backup mail server?
On the internet I found the MDaemon server configuration or as NLB. My servers can be in NLB because they are not the same extent