Amazon continues to crackdown on Kindle ebook sharing
Amazon's Send to Kindle feature will require the use of a complete email address - partial domains will no longer suffice.
PC Magazine6y
Kindle e-book formats
Amazon's Kindle readers support a variety of e-book formats, including MOBI, AZW, KF8/AZW3 and PRC. MOBI came from Mobipocket, which Amazon acquired in 2005, and files may use the MOBI or PRC ...