==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release): 0.9.8
- Linux/BSD distribution name and version: CentOS 7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? Yes v2.9.0
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

We have 2 x iRedmail Servers which installed iRedAdmin-Pro, we are planning to relocated these 2 servers to another location.

Could we create 1 x iRedmail Server with iRedAdmin only as a Backup MX to provide MX backup services for these 2 servers while relocating?

Does the MX Backup support different Master iRedmail Server IP? For example:

Server A original IP : 1.1.1.1 will be changed to 10.10.10.10
Server B original IP : 2.2.2.2 will be changed to 20.20.20.20
MX Backup Server IP : 3.3.3.3 (will not be change)

The domains in MX Backup Server I should point to new IP right?
Domain A point to 10.10.10.10
Domain B point to 20.20.20.20

And which firewall port I need to open for the MX Backup Server?

Please advise and thanks a lot.

Matt