Дополню. Вот что амазон мне прислал по поводу конвертации через e-mail. Теперь понятно, с какими форматами можно работать.The Kindle Personal Document Service can convert and deliver the following types of documents:Microsoft Word (.doc)Rich Text Format (.rtf)HTML (.htm, .html)Text (.txt) documentsArchived documents (zip , x-zip) and compressed archived documentsMobi bookImages that are of type JPEGs (.jpg), GIFs (.gif), Bitmaps (.bmp), and PNG images (.png).Adobe PDF (.pdf) documents are delivered without conversion to Kindle DX, Second Generation and Latest Generation Kindles.The following document types are converted and delivered on an experimental basis:Microsoft Word 11 (.docx)Adobe PDF (.pdf) for First Generation KindlesIf the document(s) that failed belonged to one of the above document types, please ensure the document is not password protected or encrypted. Note that the Latest Generation Kindles support password protected PDFs.Helpful tips for personal document attachments:    * The file size of each attached personal document should be less than 50MB (before compression in a ZIP file)    * The email submitted should not contain more than 25 attached personal documents