To create new list do the following:

• Log into the Control Panel. (For assistance, please refer to the following FAQ: How can I access the Control Panel?)
  
• In the menu section, click Lists.

• On the right side click Create list.

• Enter the Alias and Display Name for that list.
• Select the tickbox if you wish to accept messages from users outside your exchnage account.
  
• Click Save changes.

On the next screen you can add users to selected distribution list by clicking Add to list.

• On the right side click List aliases.

• Type the alias for distribution list and from the drop down menu select desired domain.
• Click Add new alias