GMX
If you are having problems with gmx email, check to see if you have POP3 & IMAP enabled in your GMX settings. Also, as everyone else has said make sure your username in Calibre is your full gmx email address. I had to change my email server from Gmail to gmx because I couldn't get Gmail to work again after having to change my password so I just set up a new gmx email account which didn't seem to work until I enabled the POP3 & IMAP settings in gmx and now it is working fine.
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