I'm completly lost with DNS parameters...
This is what I;ve already done:
On the webpage of my ISP, I've pointed the domain test.com to my 2 servers, as primary and secondary name server. (SRV1 and SRV2)
Now it's the time of ISPConfig.
What I want is this: the email must be read ad mail.test.com
This link must point to SRV1/roundcube and, as second option, to SRV2/roundcube, so that is SRV1 is down, the customers can read the email from the SRV2.
Of course the priority is a business of my ISP.
Now, how can I setup ISPConfig to have :
ON SRV1: mail.test.com -> SRV1/roundcube
ON SRV2: mail.test.com -> SRV2/roundcube