Sent folder only show senders name in mail apps

I have two questions regarding sent folder in mail

1. Every time i sent email from my blackberry, the sent folder in mac (i use mail apps) only shows sender's name (which is my name). How to change into the recipients name?

2. Is there a way to manage where blackberry or other smartphone arrange the sent folder? I use blackberry and samsung galaxy s2. And i have 3 sent folder, which i want to merge into only 1 sent folder.

Thanks guys