Can links be sent within my own email program and sent from my specific email address?
You can always use your own email client or your web mail account to send a link to the files in your Space.
Create a Space, click on Share. You'll be presented with the option to Share using the Hightail interface or you can copy the link by clicking on the COPY link.
Open your email client or your web mail account. Compose a new email, paste your Spaces link and add the message you'd like to include in the body of your email and send. Your recipient can either click on that link to your Space or they can copy the link into their browser's address bar.