It's an email with the subject "There was a problem with the document(s) you sent to Kindle." It says:
Quote:
The following document, sent at 06:47 AM on Sat, Aug 18, 2018 GMT could not be delivered to the Kindle you specified:
* the pier in santa monica.mobi
The Kindle Personal Document Service can convert and deliver the following types of documents:- Microsoft Word (.doc, .docx)
- Rich Text Format (.rtf)
- HTML (.htm, .html)
- Text (.txt) documents
- Archived documents (zip , x-zip) and compressed archived documents
- Mobi book
Images 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.
Adobe PDF (.pdf) can be converted to Kindle format and delivered on an experimental basis.
If the document 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
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This doesn't seem to be entirely new. We currently use an entirely different, non-Calibre system to create old format MOBI files, and users have reported that converting them to the newer MOBI format in Calibre and using Send to Kindle fails with the same message. I'd thought that might get fixed when we changed the HTML file we generate MOBIs from, but that doesn't seem to be the case.