Error with sending mail feature

[auriculares]

Hello,

I'm new to the forum, I would like to say thank you Kovid Goyal and those that maintain Calibre for that incredible peace of software !

I'm trying to set up the sending by mail feature, and I'm having some trouble. I'm using GMX and when hitting 'Try mail settings', I get the following error:

Traceback (most recent call last):
  File "/usr/lib/calibre/calibre/gui2/wizard/send_email.py", line 209, in test_email_settings
    encryption=opts.encryption, port=opts.relay_port)
  File "/usr/lib/calibre/calibre/utils/smtp.py", line 185, in sendmail
    s.sendmail(from_, to, msg)
  File "/usr/lib/calibre/calibre/utils/smtplib.py", line 773, in sendmail
    raise SMTPRecipientsRefused(senderrs)
SMTPRecipientsRefused: {u'This is a test': (501, 'Syntax error in parameters or arguments')}


Log:
connect: (u'mail.gmx.com', 587)
connect: (u'mail.gmx.com', 587)
reply: '220 gmx.com (mrgmx105) Nemesis ESMTP Service ready\r\n'
reply: retcode (220); Msg: gmx.com (mrgmx105) Nemesis ESMTP Service ready
connect: gmx.com (mrgmx105) Nemesis ESMTP Service ready
send: u'ehlo [192.168.1.18]\r\n'
reply: '250-gmx.com Hello [192.168.1.18] [82.251.79.227]\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 [192.168.1.18] [82.251.79.227]
8BITMIME
AUTH LOGIN PLAIN
SIZE 69920427
STARTTLS
send: 'STARTTLS\r\n'
reply: '220 OK\r\n'
reply: retcode (220); Msg: OK
send: u'ehlo [192.168.1.18]\r\n'
reply: '250-gmx.com Hello [192.168.1.18] [82.251.79.227]\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 [192.168.1.18] [82.251.79.227]
8BITMIME
AUTH LOGIN PLAIN
SIZE 69920427
send: AUTH <censored>
reply: '235 Authentication succeeded\r\n'
reply: retcode (235); Msg: Authentication succeeded
send: u'mail FROM:<auriculares@gmx.com> size=533\r\n'
reply: '250 Requested mail action okay, completed\r\n'
reply: retcode (250); Msg: Requested mail action okay, completed
send: u'rcpt TO:<This>\r\n'
reply: '501 Syntax error in parameters or arguments\r\n'
reply: retcode (501); Msg: Syntax error in parameters or arguments
send: 'rset\r\n'
reply: '250 OK\r\n'
reply: retcode (250); Msg: OK
send: 'quit\r\n'
reply: '221 gmx.com Service closing transmission channel\r\n'
reply: retcode (221); Msg: gmx.com Service closing transmission channel

Looking for a solution, I found a single thread with the same problem. In there, it is suggested to change the name of the computer. But the issue doesn't seem exactly the same as mine....

For details, I'm using Arch Linux and Calibre 4.5.0.

Thank you in advance,
Auriculares.

[theducks]

It appears to me (I am surly not an expert):The TARGET User (rcpt) for mailed book appears to be <this>

send: u'rcpt TO:<This>\r\n'
reply: '501 Syntax error in parameters or arguments\r\n'

are you sure you have things set up correctly?

[auriculares]

Whoops! You are completely right, I misread the text box caption... Thank you very much!

[theducks]

Originally Posted by auriculares

Whoops! You are completely right, I misread the text box caption... Thank you very much!

I love it when my WAG turns out to be correct.
Good luck