Filter: postie_filter_email

This filter is called when Postie extracts the “from” email address. For example you could use this function to create a WordPress user for this email if it came from your domain.

At the point the filter is called there is no post created.

The $email parameter is single email address.

add_filter('postie_filter_email', 'my_filterEmail');

function my_filterEmail($email) {
    //create the user
    return $email;
}