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I've been using Calibre to convert various books into 'mobi' and then mailing them to my free.kindle.com address to add them as 'personal documents'. This has been working well for a long time, but today it appears not to be working!

I get an irate reply from Amazon saying that 'the following document could not be delivered', and it doesn't appear in the 'personal document' listing.

Is this a temporary glitch or a change in policy?