Quote:
Originally Posted by kovidgoyal
If you connect your device using a usb cable instead of using email you get one big button and calibre will keep track of which books are on the device and which are not.
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But then your books won't sync between your Kindles.
For the OP, can't you just add a tag to the ones that you've sent? Or, create a custom column called "Sent to Kindle"?
Shari