Someone got my password and sent a nasty IM to a friend as me.  What can I do to prove it was not me?
830041
As a rule of thumb, don't make your passwords obvious. Make them at least 8 charactors in length with a number and a capital letter. I would not recommend tracing any ip's. Its just not worth the time or effort. I mean really what's the point? Get another account, let that one go. Just be more strict on your password selection
1098276
Wrong Password? Screenname? It could be anything.
56163
I agree with the first guy, though there is a small, very small chance that someone is indeed using your name.  Someone you know?  Or just could be because your computer froze and it didn't sign out and thus yahoo things your really signed in and ofcourse you logically know your not.  So yeah....
1063792
Hi,\nMaybe it could be that someone else used your computer, and so...\nMake sure that you are completely signed out of Yahoo IM. That will release you from their account.\nSign-in using Your own user name and password...\n\nHope it works for ya :)
219316
l.o.l that is totally funny!!\n\nwell.. if it is really the way you explained, then no its not illegal. \n\nnow, if you want to return it, then check out the additional settings and see if the user has provided for a 'alternate email' \n\nand then email him/her from his/her own account saying that u accidentally got it.. send them the new password also..\n\ndon't reveal your identity..\n\nall set done..
603319
i dont know but somebody might have hacked into your computer and got your password i recommend you to get another email address and tell everybody who emails you to email you to your new address  and also get any software that protects your computer and dont use the same password to prevent more hackers & viruses.
48637
I believe tracing is illegal. You might want to set up a new account or change your password to a very hard one. Report hacking to Yahoo and see what they say. If you're using wireless internet, then people may be seeing what info you are sending. Try to always log in secured. Or lock your internet. If its public,then I don't know what to say.
1043805
If it's yours just delete it. if it's someone else's report it
373979
If you can prove that your account is hacked, contact the police.  They will put you in touch with the appropriate people...
673003
other user name woow u can hack therre ids by changin passwords\nok dont worry\nbefore u login just delete all cookies and temporary internet files under\ntools-->internet options delete them \nand login now fresh everything goes fine
229064
Contact yahoo staff and ask them for a new password.\nAnd Y! Staff can also be able to ban the phishers IP...
114922
If you are using Yahoo! mail, you should click on the 'Full Headers' link to view more information about the e-mail. This is a good place to start. The rest is hacking and well you're on your own in that regard.
1001030
First of all, what program or website?  Is it a banking institution?  If its a website, just change your password to something absolutely UNIQUE, such as *&%%HGFndke or the like.  Then notify the company that someone has stolen your password or identity ASAP!
277124
If you are truly talking about the windows "Net Send" command the computer of origin is part of the message and message box.  You could then find that computer and possibly find out who was signed on at the time.
674646
Your ID may have been hacked. Use the "forgot my password" link in Y! mail to generate a new password. Also, check whether you are using a local version of Y! messenger instead of the global version
439448
contact yahoo help immediately,\nchange your password. \nmay be someone is gaming with your account.
158218
First off, how do you know it is a she? It sounds like maybe you know who the hacker is. \n\nIn either case, change your password.