If you need a refresher on the official instructions, visit https://www.amazon.com/gp/sendtokindle/email.
Basically, you can email many kinds of files to your Kindle. Once you log into your Amazon accounts, you can browse to your Kindle and find the "Send-to-Kindle" email address for your specific device.
Supported File Types include:
- Microsoft Word (.DOC, .DOCX)
- HTML (.HTML, .HTM)
- RTF (.RTF)
- JPEG (.JPEG, .JPG)
- Kindle Format (.MOBI, .AZW)
- GIF (.GIF)
- PNG (.PNG)
- BMP (.BMP)
- PDF (.PDF)
Note: If you send a PDF and wish to convert it to Kindle format, use the subject line "convert" to automatically enable conversion. This will allow you to use variable font sizes, annotations, and Whispersync.
You must send emails from the email address associated with your account and device.
For more information, instructions, and details, visit that page: https://www.amazon.com/gp/sendtokindle/email and check out the Help Page linked from their.