unable to access using www.abc.com

[kreya]

hi,
i am trying to setup a mail server in my office. i am bale to access the ispbox using https://192.168.1.200:81 but not https://www.abc.com:81

i have a registered domain but not using it right now on the ispbox.
i have a static ip assigned to my router. the setup is
router--systems

my /etc/hosts conf is
127.0.0.1 localhost.localdomain localhost
192.168.1.200 abc.com abc
::1 abc.com abc localhost.localdomain localhost

/etc/resolv.conf
search abc.com
nameserver 127.0.0.1
nameserver 192.168.1.200


i just wanna setup a mail server as of now sending & receiving mails both internally and externally . i would post any other configuration/output if needed.
any help would be greatly appreciated.

[falko]

You must create an A record for www.abc.com so that it points to your router's public IP address. And you must configure your router so that it forwards port 81 to your ISPConfig server. And you must make sure that your ISP doesn't block port 81.