|  04-23-2015, 11:11 AM | #1 | 
| Junior Member  Posts: 4 Karma: 10 Join Date: Apr 2015 Device: kindle paperwhite | 
				
				Desperate!  Calibre no longer sends books to my kindle
			 
			
			Previously, I was able to send ebooks to my kindle with no problem.  Then suddenly, the sends failed.  I've tried disabling firewall, signing up for a gmx account, checking that the addresses were on my amazon approved sender list to no avail.  I've even tried restoring the computer to the point where calibre worked and nothing has helped. I won't post the entire error message, but this seems to be why it failed send: AUTH <censored> reply: '535 Authentication credentials invalid\r\n' reply: retcode (535); Msg: Authentication credentials invalid Sending failed... How do I fix this? Please help! | 
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|  04-23-2015, 11:25 AM | #2 | 
| Junior Member  Posts: 4 Karma: 10 Join Date: Apr 2015 Device: kindle paperwhite | 
			
			I'm not sure if this matters, but my OS is Windows 8
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|  04-23-2015, 04:35 PM | #3 | 
| Grand Sorcerer            Posts: 13,693 Karma: 79983758 Join Date: Nov 2007 Location: Toronto Device: Libra H2O, Libra Colour | 
			
			This seems to say quite clearly that your account info for your email provider is not correct.
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|  04-24-2015, 01:32 AM | #4 | 
| Junior Member  Posts: 4 Karma: 10 Join Date: Apr 2015 Device: kindle paperwhite | 
			
			But, why would it suddenly be incorrect when it has worked without problem before?  The password and the email account are correct.  The other info is what calibre itself put in.  The amazon info is correct as well.
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|  04-24-2015, 02:11 AM | #5 | 
| creator of calibre            Posts: 45,604 Karma: 28548974 Join Date: Oct 2006 Location: Mumbai, India Device: Various | 
			
			Maybe because you are using gmail and gmail no longer support SMTP properly. See the second note here: http://manual.calibre-ebook.com/faq....-using-calibre
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|  05-01-2015, 03:00 AM | #6 | |
| Junior Member  Posts: 4 Karma: 10 Join Date: Apr 2015 Device: kindle paperwhite | Quote: 
 I'm using a gmx account that is exclusively for calibre. It now works intermittently. I've not used gmail at all for calibre. | |
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|  05-01-2015, 05:58 AM | #7 | 
| null operator (he/him)            Posts: 22,010 Karma: 30277294 Join Date: Mar 2012 Location: Sydney Australia Device: none | 
			
			@M98 - when it doesn't work try ping http://www.gmx.com/  The GMX site has a history over recent months of intermittently disappearing from random domain name servers. Usually comes back within 2-3 days! You could try using a different domain name server. And when it happens, associated companies 1&1 and United Internet also disappear. BR | 
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