I switched my server from Debian 8 to CentOS 7 and reinstalled Virtualmin.
I successfully created a top-level virtual server and can see the web page for it. At this time I’m only using this server as a nameserver, so I didn’t set up any e-mail for it.
I successfully created another virtual server which is a sub-server of the first server. I intend to use this server for a website and tried to set up an e-mail address for it. I created a user. When creating this user I only entered information in the Email address, Real name and Password fields. I didn’t enter anything else or alter any settings.
I tried sending e-mail to this address but never received it in Usermin. Also in Usermin, I tried sending e-mail from this user, but got an error: “Failed to send mail : SMTP command failed : ”.
I then created a user in the top-level virtual server to see if e-mail worked in it, but I got the same result.
What should I do?