Comment 7 for bug 1995772

This is what I'm getting when I mail to gmx.com from my Kindle using Calibre:
Traceback (most recent call last):
  File "calibre\gui2\email.py", line 47, in run
  File "calibre\gui2\email.py", line 136, in sendmail
  File "calibre\utils\smtp.py", line 162, in sendmail
  File "calibre\utils\smtp.py", line 142, in sendmail_direct
OSError: Failed to send mail: SMTPServerDisconnected('Connection unexpectedly closed: [WinError 10053] An established connection was aborted by the software in your host machine')

This is what I get when I send to my Kindle address from Calibre:
Traceback (most recent call last):
  File "calibre\gui2\email.py", line 47, in run
  File "calibre\gui2\email.py", line 136, in sendmail
  File "calibre\utils\smtp.py", line 162, in sendmail
  File "calibre\utils\smtp.py", line 142, in sendmail_direct
OSError: Failed to send mail: SMTPRecipientsRefused({'<email address hidden>': (550, b'5.7.1 IP address blacklisted by recipient')})

Please help. I sent you $25 last year and was happy to do it. But I hesitate to send money this year, since the books aren't going to my Kindle.