Quote:
Originally Posted by RaquelAB
Hello everyone! this is my first post and I apologize in advance if I'm not doing it right. 
Well, I have installed the latest Calibre update and since then it doesn't send me the documents to my device. I have verified that the sending email was allowed, also the most "obvious" options, but it still doesn't send the documents and when I try to send an email, I get the following:
reply: b'535 Authentication credentials invalid\r\n'
reply: retcode (535); Msg: b'Authentication credentials invalid'
Could someone tell me how to fix it?  |
I had that happen just the other day, with the same error: "Authentication credentials invalid".
As I had never changed the password for this GMX account, which has an alias that I use occasionally just for Calibre, this seemed very odd.
So I decided to change the password on GMX, updated that in Calibre, and it worked.
