A post-by-email file is a special type of file recognised by many email clients. When you download it, it will go in your downloads folder ready for use.
To use it, just double click it and it will open in your email client. Change the email address given to the secret one for your blog before sending.
If you're using a Mac, you won't be able to change the email address until you choose Message->Send Again
Note that you don't have to send it to your blog, you can also send it to friends, customers and so on.
If you want to change the description that goes with it, edit the text in the box below and it'll be used.
editable description - used automatically when pinning and with post-by-email. Copy and paste when sharing to Facebook