You can quickly send the images from a Favorite List to a specific email address or multiple email addresses. You can find this by opening the Collection, and navigating to the Activities tab > Favorite Activities > More > Send as Download.
You can include a custom message, and select from the available Download Sizes. Once you click Send, clients will receive an email containing the download link allowing them to download a .ZIP file with all the images.
Note: using the Send as Download feature will override your collection's download settings. If you have configured your Sets so that some Sets cannot be downloaded, this feature will override that setting, and all of the selected Favorites will be delivered.