I keep getting spam in my YM (Yahoo Messenger) another Instant Messaging application from my contacts
It is usually a chain letter about this and that and comes with several statements that if you don't send this message (copy paste it) to all of your contacts within the specified time limit,you're gonna suffer consequences,curses,etc.

Nothing did happened except that in one incident,when i ignored the most unbelievable,irritating message
"If you don't send this message to all of your contacts sooner,your username will be deleted" after several
minutes YM stopped running and then signed out so i was unable to connect and waited for like 3 hours and so I contacted YM support so after they sent me a reply,I was able to sign in again

Is there any way to stop this? Or any Anti-Spam software that can be monitoring IM applications?
(wether free or not free)
Or did i missed something in YM that there was this called "SPAM filter" function in it.

If you are using the latest version you can click on a link to report as spam from within YM. If you don't see links to report, look under your preferences & add them to the Ignore List. There's also an option to ignore anyone who is not on your list.

How do I report spam ?

Report Spam Version 7

Other Versions

Ok thanks for the info
Are there any good free Anti-Spam Applications you use?

Not for IM. I use the paid version of Mailwasher to preview my email. The free version is limited to one email account. I have not used it yet but, if you are interested, Pop Peeper is one that I have seen recommended several times here.