I have two servers with Ubuntu 16.04 LTS and with latest ISP. Domain is deployed on first and there is also MX pointing to this server. I would like to also provide secondary MX which would be second server with ISP. What should I do to provide this - only put the name or IP of second server in MX record of domain's dns zone?
If you want more MX records you create more MX records. Put the name of the server in MX record, and make sure the name has an A record. But for the second mail server to actually work in a useful way, it has to have the same e-mail domains configured and the same e-mail accounts. So you have to syncronise the two mail servers. There must be a tutorial on this.
Thank you. Server is available in WAN, also has visible hostname. Now only synchronizing two ISP servers part left.
Take a look on the Tutorials, you'll see something like "Installing a Web, Email & MySQL Database Cluster on Debian 8.4 Jessie with ISPConfig 3.1". It was a good starting point for me.
