Trash File

[CarGo]

In my C:\Program Files\Netscape\Users\cargo14\Mail directory is a
'Trash' file with no extension that grows each time I delete messages
from the Trash directory under 'local Mail'.  The file is now over 132MB
and I need the space on my hard drive.

I don't want these messages at all anymore - that's why I deleted them.
Can I just delete the file without fouling up the rest of the program?
How can I prevent this residue build-up in the future?

Any help would be most appreciated.

Thanks,
CarGo