Ok recently these packet editors have been crashing servers by bombarding them with "player joined". They also rename players, and change players fur colours. They also make people say things that they didn't. I have found a solution which seems to work for me.

In your banlist.lst insert a blank line
To open it choose notepad.

Heres what mine looks like (sorry to platty)
------------------------------------------
; Example: Uncomment the next line to deny access to all users who try to
; log on from IP 129.0.22.12.
;129.0.22.12
test
dude
SAMALNMDER WAC

sÀlÄmÃnDèR WAC
Hi Is Not A Noun
JazzTool 12
-------------------------------------------

Now the line which is between the SAMALNMDER WAC and sÀlÄmÃnDèR WAC is completely blank All I did was push enter.
The Packet editors use no name characters to do their evil things. So once you add this they wont be able to hack your server.
Make sure ther are no spaces
just a good push of the enter key.

This is not guaranteed to work as it's not exactly easy to find people to help me test it. One person did though and they said they couldn't do anytinhg to my serv. If you guys find out any other solutions or find any probs or hav questions just say so : P.