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Old 02-11-2017, 03:53 AM   #30
Cafe Liang
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Cafe Liang began at the beginning.
 
Posts: 1
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Join Date: Feb 2017
Device: Kindle paper white
Just found a solution for GMX users!

Previously I've done everything as the Calibre FAQ page says, but still got SMTPAuthenticationError.

Now I found out that we also need to activate POP3/IMAP in GMX setting, as the following page explains.
https://support.gmx.com/pop-imap/toggle.html

Hope it helps!
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