When you export an ebook from calibre's library, metadata is updated in that ebook. So there is no need to send someone an opf file. Indeed, if you are sharing with a limited number of people, simply use email sending in calibre.
@kiwidude: I know you're going to say, but I have my dad turn off read metadata. Even in that case the title and author will be imported correctlt, since, IIRC the default filename regex works with the default save to disk template. So you dad will have title/author and date added set correctly.
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