You can use up to 10 photos from any event, Faces collection, Places collection, or album in an iPhoto email.
Notes and Tips
When this box is checked, you can use the Photo Size pop-up menu to specify how large your photo attachments should be. The Optimized option provides a nice balance between file size and photo quality. If you anticipate your recipients may want to print the attachments, consider using the Large or Actual Size option.
Customizing the email. You can customize many aspects of an iPhoto email: ...
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