Office 365 (Outlook 2010) - Message Delivery Options
Outlook 2010 offers a number of delivery options, including receipts for message tracking, delayed delivery, and reply-to settings.
These options can be easily accessed from the message composition window.
While composing a message, click on the Options tab to view basic delivery options.
Selecting the open window icon in the lower right-hand corner of the Tracking and More Options areas will open a separate window with additional delivery options.