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Rock should make it easier to save drafts of emails being composed. There is a "Save Draft" button, but not on the composition screen. You don't get the option to save a draft until after you've already clicked "Complete."
It would be great to have either a "Save Draft" button (near the "Test" and "View" buttons) or, even better, a regular auto-save. These features are common in competitive email products like MailChimp, ConstantContact, and so on.
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