Implementing categories into Subscribe by email plugin

I wonder how can I get help on implementing categories into your plugin “Subscribe by EMmail”
It’s not on WPMU anymore so l wonder whom to ask for help. This is not a feature of the plugin, but it can display the author.
So I assume, it also could pull the post category from database. This should be a small thing only for anybody who know how to do it.

I like to add the post category to the email that’s generated.