Custom Postie Configuration (Wordpress Plugin)

I'm trying to configure a Wordpress blog in order to be able to upload posts by email. In order to do so I want to configure the Wordpress Plugin: Postie [login to view URL] Postie allows a lot of functionalities when uploading posts by email, see usage notes here: [login to view URL] and here [login to view URL] Now, I need to insert a filter function inside the plugin in order to do the following: 1. Whenever I send an email from a specific email address, (email author) a specific category should be attached to that post. Example: User "AA" has email address: AAatGmail Send Email from AAatGmail to UploadPostbyEmailatGmail, Postie parses the email and Email is posted inside Category AA Refer to file: postie_post filter. Two short examples are included in the [login to view URL] file, inside the plugin files. 2. Post Body must remain empty, regardless of what is included inside the email. Only Subject (=Title of Post) must be displayed. Refer to shortcodes :start and :end as part of Posties functionalities. Project should be basic PHP programming for someone who can deal with Wordpress Plugins and functions. I simply don't have the time to do this, and need this ASAP. Thanks