this is already working in the current version of postie. please read the readme.txt..
“= Category and tag handling =
* If you put a category name in the subject with a : it will be used
as the category for the post
* If you put a category id number in the subject with a : it will
be used as the category for the post
* If you put the first part of a category name it will be posted in
the first category that the system finds that matches – so if you put
Subject: Gen: New News
The system will post that in General.
“
tested and working.. ..did i miss something?