Hey there jasjonjkay, don't be confused, it's really simple: Log in to your Amazon account, and visit this
URL. At the very top you should see your unique Amazon Kindle E-mail Address.
To correctly edit your config.ini file check the
Configuration section of the Readme. Let's just assume that you have a Gmail address, if you don't, for sake of simplicity, just create a Gmail address which you specifically use with Lemon. Copy and paste the sample config.ini content in the Readme into your own and change "Username" and "Sender" to your Gmail address and "Password" to your Gmail password.
For "Recipient" you define your unique Amazon Kindle E-mail Address with the ending @free.kindle.com. So assuming your unique Amazon Kindle E-mail Address looks something like this:
jasonjkay@kindle.com enter this
jasonjkay@free.kindle.com.
Last but not least
whitelist your Gmail address (search for "Your Kindle Approved E-mail List"). Then start the executable/main.py script.
As for your question, saving it to disk shouldn't be much of a problem, but there might very well arise some issues with cross-platform encoding of filenames, so I would like to avoid that, seeing as the E-mail solution works perfectly.