Thread: Kindle Scribe - Test email inside Calibre failing, help?
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Old 02-21-2024, 09:39 PM   #3
kovidgoyal
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Authentication credentials invalid means gmx thinks your username and/or password are invalid. If you are sure they are correct make sure you have enabled SMTP sending in the GMX account preferences as descibed in the FAQ https://manual.calibre-ebook.com/faq...-using-calibre
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