Shotwell can send photos using the GNOME desktop's Send To mechanism, which lets you send photos via email, instant messaging or in other ways.

To send photos, select them in Shotwell and choose FileSend To..., or right-click the photos and choose Send To... from the context menu. A Send To dialog box will appear which lets you choose a mechanism for sending the files (such as email or instant messaging) and a destination. You can optionally choose to send the files in a compressed format.