Sending photos
Shotwell can send photos using the GNOME desktop's Send To mechanism, which lets you send photos via email.
To send photos, select them in Shotwell and choose File ▸ Send To..., or right-click the photos and choose Send To... from the context menu. A Send To dialog box will appear which lets you optionally remove any meta-data, scale it or change the format before passing it on to your configured email client.