After logging into the domain's cPanel you do not have a section titled Mail? Only thing I can think of is you have these options disabled in the Feature Manager for the package you defined.
In WHM under Packages go to the Feature Manager. Select the feature list used (default unless you created your own) and check or uncheck the features you want enabled for the package. I'm unsure whether or not changes made here take effect immediately or if the package needs to somehow be reppaplied to the account but see if editing the feature list helps for now.
Both, list of options you've provided and screen shot shows that you're logging into the WHM instead of cPanel. Try to login to cPanel at http://your-vps-ip:2082/ using the username and password of the account you've created.