[ChipAHoy]

Does this log indicate why sending ebooks to my GMX account is not working? Thanks for any help.

Traceback (most recent call last):
File "site-packages\calibre\gui2\wizard\send_email.py", line 209, in test_email_settings
File "site-packages\calibre\utils\smtp.py", line 182, in sendmail
File "site-packages\calibre\utils\smtplib.py", line 645, in login
SMTPAuthenticationError: (535, 'Authentication credentials invalid')


Log:
connect: (u'mail.gmx.com', 587)
connect: (u'mail.gmx.com', 587)
reply: '220 gmx.com (mrgmx005) Nemesis ESMTP Service ready\r\n'
reply: retcode (220); Msg: gmx.com (mrgmx005) Nemesis ESMTP Service ready
connect: gmx.com (mrgmx005) Nemesis ESMTP Service ready
send: u'ehlo [10.58.0.122]\r\n'
reply: '250-gmx.com Hello [10.58.0.122] [104.143.92.125]\r\n'
reply: '250-8BITMIME\r\n'
reply: '250-AUTH LOGIN PLAIN\r\n'
reply: '250-SIZE 69920427\r\n'
reply: '250 STARTTLS\r\n'
reply: retcode (250); Msg: gmx.com Hello [10.58.0.122] [104.143.92.125]
8BITMIME
AUTH LOGIN PLAIN
SIZE 69920427
STARTTLS
send: 'STARTTLS\r\n'
reply: '220 OK\r\n'
reply: retcode (220); Msg: OK
send: u'ehlo [10.58.0.122]\r\n'
reply: '250-gmx.com Hello [10.58.0.122] [104.143.92.125]\r\n'
reply: '250-8BITMIME\r\n'
reply: '250-AUTH LOGIN PLAIN\r\n'
reply: '250 SIZE 69920427\r\n'
reply: retcode (250); Msg: gmx.com Hello [10.58.0.122] [104.143.92.125]
8BITMIME
AUTH LOGIN PLAIN
SIZE 69920427
send: AUTH <censored>
reply: '535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: Authentication credentials invalid