Quote:
Originally Posted by heymynameisben
I encountered the same problem and found a fix.
On the GMX website, go to settings -> POP3 & IMAP
and tick "Send and receive emails via external program (Outlook, Thunderbird)"
Hope this helps someone
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I registered for a new GMX account and failed to get the account "verified" by GMX in Preference\Sharing books by email\Test email button.
Then, I go to the setting for E-mail on GMX, and clicked on POP3 & IMAP ==> checking the following box solved the problem.

Image link:
https://www.dropbox.com/s/zmghahcphw...72712.png?dl=0