Quote:
Originally Posted by fetito666
Thank you! I have read that FAQ yesterday.
I repeat: Two days ago Calibre worked fine, but after reinstalling the OS, I just cannot send the books to my Kindle.
It used to work fine before I reinstalled Windows 10 again.
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Well, maybe your reinstall went off track.

e-mail settings are details must be right, fussy
Your Anti Virus may be blocking (anti-bot measures) apps that 'mail' stuff, requiring you to 'allow'
Your GMX account may have been deleted (if that was your host). Test that direct to see if it is still working.
The biggest problem with e-mail accounts: They were set up (and debugged) 5 years or more ago, and they just work. You forget what you had to tweak to get it working.