Sending failed...
Traceback (most recent call last):
File "site-packages\calibre\gui2\email.py", line 44, in run
File "site-packages\calibre\gui2\email.py", line 134, in sendmail
File "site-packages\calibre\utils\smtp.py", line 136, in sendmail
File "site-packages\calibre\utils\smtp.py", line 128, in sendmail_direct
IOError: Failed to send mail: SMTPServerDisconnected('Connection unexpectedly closed: [Errno 10053] An established connection was aborted by the software in your host machine',)
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