Sharing books not working

[EterMax]

Aquí tienes la traducción al inglés:

"Hello,
I've been using Calibre for years and never had any problems. I'm trying to send a book to my Kindle, as usual (and using a GMX email account), but it's not working.
Can you help me?"

Spoiler:

Starting job: Email Cosas que nunca creeriais to zzzz@kindle.com
Waiting 301 seconds before sending, to avoid being marked as spam.
You can control this delay via Preferences->Tweaks
connect: to ('mail.gmx.com', 587) None
reply: b'220 gmx.net (mrgmx005) Nemesis ESMTP Service ready\r\n'
reply: retcode (220); Msg: b'gmx.net (mrgmx005) Nemesis ESMTP Service ready'
connect: b'gmx.net (mrgmx005) Nemesis ESMTP Service ready'
send: 'ehlo localhost.localdomain\r\n'
reply: b'250-gmx.net Hello localhost.localdomain [152.170.102.78]\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-SIZE 141557760\r\n'
reply: b'250 STARTTLS\r\n'
reply: retcode (250); Msg: b'gmx.net Hello localhost.localdomain [152.170.102.78]\n8BITMIME\nSIZE 141557760\nSTARTTLS'
send: 'STARTTLS\r\n'
reply: b'220 OK\r\n'
reply: retcode (220); Msg: b'OK'
send: 'ehlo localhost.localdomain\r\n'
reply: b'250-gmx.net Hello localhost.localdomain [152.170.102.78]\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-AUTH PLAIN LOGIN\r\n'
reply: b'250 SIZE 141557760\r\n'
reply: retcode (250); Msg: b'gmx.net Hello localhost.localdomain [152.170.102.78]\n8BITMIME\nAUTH PLAIN LOGIN\nSIZE 141557760'
send: AUTH
reply: b'535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: b'Authentication credentials invalid'
send: AUTH
reply: b'334 UGFzc3dvcmQ6\r\n'
reply: retcode (334); Msg: b'UGFzc3dvcmQ6'
send: 'MTY0M1JheXVlbGE=\r\n'
reply: b'535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: b'Authentication credentials invalid'

Sending failed...

Traceback (most recent call last):
File "calibre/gui2/email.py", line 45, in run
File "calibre/gui2/email.py", line 132, in sendmail
File "calibre/utils/smtp.py", line 187, in sendmail
File "smtplib.py", line 750, in login
File "smtplib.py", line 739, in login
File "smtplib.py", line 662, in auth
smtplib.SMTPAuthenticationError: (535, b'Authentication credentials invalid')


Retrying in 301 seconds...

Waiting 301 seconds before sending, to avoid being marked as spam.
You can control this delay via Preferences->Tweaks
connect: to ('mail.gmx.com', 587) None
reply: b'220 gmx.net (mrgmx104) Nemesis ESMTP Service ready\r\n'
reply: retcode (220); Msg: b'gmx.net (mrgmx104) Nemesis ESMTP Service ready'
connect: b'gmx.net (mrgmx104) Nemesis ESMTP Service ready'
send: 'ehlo localhost.localdomain\r\n'
reply: b'250-gmx.net Hello localhost.localdomain [152.170.102.78]\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-SIZE 141557760\r\n'
reply: b'250 STARTTLS\r\n'
reply: retcode (250); Msg: b'gmx.net Hello localhost.localdomain [152.170.102.78]\n8BITMIME\nSIZE 141557760\nSTARTTLS'
send: 'STARTTLS\r\n'
reply: b'220 OK\r\n'
reply: retcode (220); Msg: b'OK'
send: 'ehlo localhost.localdomain\r\n'
reply: b'250-gmx.net Hello localhost.localdomain [152.170.102.78]\r\n'
reply: b'250-8BITMIME\r\n'
reply: b'250-AUTH PLAIN LOGIN\r\n'
reply: b'250 SIZE 141557760\r\n'
reply: retcode (250); Msg: b'gmx.net Hello localhost.localdomain [152.170.102.78]\n8BITMIME\nAUTH PLAIN LOGIN\nSIZE 141557760'
send: AUTH
reply: b'535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: b'Authentication credentials invalid'
send: AUTH
reply: b'334 UGFzc3dvcmQ6\r\n'
reply: retcode (334); Msg: b'UGFzc3dvcmQ6'
send: 'MTY0M1JheXVlbGE=\r\n'
reply: b'535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: b'Authentication credentials invalid'

Sending failed...

Traceback (most recent call last):
File "calibre/gui2/email.py", line 45, in run
File "calibre/gui2/email.py", line 132, in sendmail
File "calibre/utils/smtp.py", line 187, in sendmail
File "smtplib.py", line 750, in login
File "smtplib.py", line 739, in login
File "smtplib.py", line 662, in auth
smtplib.SMTPAuthenticationError: (535, b'Authentication credentials invalid')

Job: "Email Cosas que nunca creeriais to zzzz@kindle.com" failed with error:
Traceback (most recent call last):
File "calibre/gui2/threaded_jobs.py", line 85, in start_work
File "calibre/gui2/email.py", line 100, in __call__
File "calibre/gui2/email.py", line 45, in run
File "calibre/gui2/email.py", line 132, in sendmail
File "calibre/utils/smtp.py", line 187, in sendmail
File "smtplib.py", line 750, in login
File "smtplib.py", line 739, in login
File "smtplib.py", line 662, in auth
smtplib.SMTPAuthenticationError: (535, b'Authentication credentials invalid')

Called with args: ('/var/folders/q1/h_m02bhd3_j37d08wm26c5k40000gn/C/calibre-e8fz0wit/njk5l_4qcaltmpfmt.epub', 'Cosas que nunca creeriais.epub', 'zzzz@kindle.com', 'Incorporate cycle video', 'Symptom join carry wrap close mistake need classroom true until hot fall. Many core arise child tour wear transition soup ms framework stage wound asian.') {'notifications': , 'abort': , 'log': }

[Quoth]

Use USB and stop giving Amazon free copies!

[kovidgoyal]

That error indicates the username/password you are using for your email server are incorrect. Remember th eusername is the full email address.