[gbrindisi]

I like and I'll try it out for sure (and thanks for the source code!)

A genuine question: how does Amazon check the autenticity of received emails? I mean: what if I forge the email address you use to send articles?

[dwwoelfel]

You have to add an email address to a list of "trusted contacts" before Amazon will accept emails from it.

[jrockway]

You can also set a maximum cost-per-day. People can email you a document that would cost $329874 to convert, but $329874 is greater than what you've set, it will be rejected.

I have never had a problem with Kindle spam.

[devicenull]

You get a special 'secret' email for your kindle. You aren't supposed to share it with people, so it's relatively secure. You can also change it at any time if someone does manage to get it.