Thank you very much for the review, it is really appreciated.
We answer of all questions in our support forum, but question about this is not received. You can post Your questions in support forum here: http://3dwebdesign.org/forum/index.php?showforum=24
About unsolicited email: extension can work with many email boxes. If you want to post only your own content, use secret name for mail box that is not known from another person. This work in exact way in wordpress and any other cms supporting post by email. Instead of this Your idea to import emails only from certain authors is good and will be included in next version.
I'm in the habit of making a small donation on any module or plugin I find useful and has saved me hours or time. Couldn't find anything for Andrea, so I owe him a dinner.