mail server not working

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

Vhosts_ispconfig.conf
<VirtualHost 192.168.1.200:80>
ServerName www.abcmail.com:80
ServerAdmin [email protected]
DocumentRoot /var/www/web1/web
ServerAlias www.abcmail.com


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.

 

Please don't double-post!