Do RAR's even offer much compression on an EPUB? The other day I was trying to send my wife some EPUBs over email and tried zipping them to get them under the 25mb attachment limit, but the ZIP file barely shaved more than a meg or two off the filesize versus just sending the EPUBs individually. 7-zip wasn't much better, and I couldn't guarantee that she had 7-zip installed on her PC. I ended up just sending her two emails.
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