Okay, I just registered here to post this. I have been using Calibre 0.94 for years with no email to Kindle problems with multiple devices. Stopped working a few weeks ago as everyone else reports. I upgraded to Calibre 2.64. That version provides a Python error and won't run on Win7-32bit. Downgraded to 1.48 after full uninstall of 2.64. 1.48 gives identical results as 0.94. I have the email preferences set to use my Comcast smtp outgoing server, it successfully tests (as usual). Same as everyone else, test message generates amazon no attachment message. When I send actual ebook file no error message but nothing shown in amazon pending deliveries and nothing ever delivered. If I send the file through Thunderbird using identical email settings as Calibre configured with, it works fine. I am at a loss to understand how Amazon can tell the difference; my machine is sending the file using same outgoing server either with Thunderbird or Calibre. If I send from Calibre to myself the email looks fine. Same originating email address in both cases. Reading the FAQ tells me to use GMX and to select a "GMX button" -- which does not seem to exist in 1.48. Any suggestions now?
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