August 24, 2016
I had a similar problem. I followed the ideas here and elsewhere. Spent an hour and a half. Didn't fix. Neither did the gmx email idea (maybe my fault?). I did have easy success as follows, and am sharing it as it may save someone some time. I located the calibre library folder and located the mobi file I wanted to send to my tablet. I opened my gmail, pressed the 'compose' button for a new email. I attached the mobi file and emailed the device. That worked.
I suspect gmail might be preventing apps from initiating emails; if that is the case, maybe that is a good thing.
I hope this helps.
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