Pine configuration

Hi susers! I solved the folders issue posted earlier, however another question has reared its ugly head..its a header issue... I have changed my "from" header to reflect my correct adress, however I notice that "sender" shows another adress an adress that...perhaps I should explain. I am working on my laptop which is called "laptop" however there is no account called laptop on the server and subsequently there is no reason why "laptop" should appear in any header. Anyone have an answer to this one? Thomas