Use the following for halting private messages with kolayweb.com in it only:

Code:
On ^*:OPEN:?:*: if (kolayweb.com isin $strip($1-)) { halt }
For a more elaborate advertisement blocker, see this other thread.

Also, if you're on DALnet, you may consider using usermode +R which will block all messages from nicknames that have not been identified to. Read more about that at DALnet's Documentation Website.

"Any sufficiently advanced technology is indistinguishable from magic." - Arthur C. Clarke