I email books to people all the time. I never know what device they have, but I always email epub2. I have had no complaints or difficulties. The epub2 seems to work satisfactorily on everybody's reader (except for Kindles, but they can use "Send to Kindle" to get a readable book. I haven't tried epub3 but I would tend to doubt it would work as seamlessly.
In a sense, this is just a rephrasing of what other people have said earlier in this thread: epub2 works. Anything else is likely to need some intervention by you.
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