Following my last post I now found out that Webmin does not allow multi virtual servers :-(, BUT there is a module called Virtualmin Virtual Servers (GPL) which is what I need.

To save myself hassle, I installed a compatible OS (CentOS 6 64bit) and simply installed virtualmin from the install.sh command after downloading it:

cd /root
wget http://software.virtualmin.com/gpl/scripts/install.sh
sh ./install.sh

After this my next  move was to install csf lfd from configserver.com:
(there is now a new URI for the archive which I changed on 2017-02-08)

wget http://www.configserver.com/free/csf.tgz
wget https://download.configserver.com/csf.tgz
tar zxvf csf.tgz
cd csf
sh ./install.sh

Once installed integrate it in Webmin and you’re good to go.

– Install the csf webmin module in:
Webmin > Webmin Configuration > Webmin Modules > From local file > /etc/csf/csfwebmin.tgz > Install Module

Email access problems

All worked well from the word go except SMTP/POP3 (Dovecot) server; I was getting Failed to connect to localhost:143 : Connection refused  (as well as port 993,995,110 and 25) when trying to connect either via my email client or usermin.

System Information was reporting that Dovecot IMAP / POP3 Server was offline, and trying to start Dovecot failed:

Starting dovecot: Error: socket() failed: Address family not supported by protocol
Error: service(pop3-login): listen(::, 110) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(pop3-login): listen(::, 995) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(imap-login): listen(::, 143) failed: Address family not supported by protocol
Error: socket() failed: Address family not supported by protocol
Error: service(imap-login): listen(::, 993) failed: Address family not supported by protocol
Fatal: Failed to start listeners

After editing the /etc/dovecot/dovecot.conf file and commenting out/insert: listen = *  Here is how my edited file looks like:

# A comma separated list of IPs or hosts where to listen in for connections. 
# "*" listens in all IPv4 interfaces, "::" listens in all IPv6 interfaces.
# If you want to specify non-default ports or anything more complex,
# edit conf.d/master.conf.
#listen = *, ::
listen = *

Now, why would Dovecot server come with this line disabled is baffling, anyway, after this, Dovecot starts fine allowing usermin and email clients to connect without problems: