Sorry, don't use (any more) or know anything about NS. I do have the book that came with it and it does talk about how to create filters. Look in the 'Mail' window and pull down the 'Tools' menu and choose 'Message Filters.' Since I don't have it installed, I assume you can tell the filter to send the stuff to the 'Trash' folder. If this is similar to Eudora, the Trash is really just like any user-created folder with the big exception that there is a menu command that will allow you to really delete everything in it. One command, no individual delete commands for each message, all at once, all or nothing.
I like POPmonitor because it is running all the time and I can check it occasionally to see what's there, especially if I'm looking for a particular response. Plus, I can tell it to 'Block' messages and I will never even retrieve them when I use Eudora (or whatever client I might use) to actually download messages.
Since I use a separate e-mail program, I don'tt worry about accidentally/automatically downloading e-mail while I am surfing. It's just my way of doing things. You can certainly do it differently (even if my way [b[is[/b] better! )
Jim C.