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That's fairly normal in some email systems at least. An email you are composing is called a 'Draft' email. So if you don't send it, it is saved in 'Drafts'.
Go to the Drafts folder.
Click on the message's entry there. It should open the composed email just as it was when it was saved. From there you can edit it, or Send it.
(If this answers your question, please rate my answer. Thanks.)