How do I fix a mistake in a feature of Kmail?

[Steven Vollom]

> No, Kmail has a truly annoying "recent addresses" feature.  Editing anything
> out of it is practically impossible.  I've dug right into the "*rc" files
> and still have addresses I don't want popping up.
>   
Dear Derek,

When you were in the 'rc' files, did you find what you wanted to 
remove?  Did you simply delete it from the 'rc' file to remove it, if 
your answer is yes?  Then when you closed the 'rc' file it was gone?

Steven