How to prevent email id from being used to send out bogus emails?

My yahoo email id was "hijacked" last week and bogus emails were sent out under my id to my contact list. I have a macbook with snow leopard and norton antivirus. What can I do to prevent this from happening again.

Welcome to Apple Support Communities.
If you haven't already done so, change your Yahoo password to something extremely secure.
Then go to Yahoo's recommendations for compromised accounts, found here:
http://help.yahoo.com/kb/index?page=content&y=PROD_MAIL_CLASSIC&locale=en_US&id= SLN3420&pir=.ERun_NibUlqprOy6AQ5KLRAOrUdr0acOZBh12BjZ6uUgTx7O5KFy_g3RVY.usintguY mSbHjESfUDXQC_FwPo2Cxt_KEGnx3QnKIu6C7_5._vmX207fxMRD53yXCsEdulnEIA1af.bHN_fWp2R_ tQ_5VnaDSXZv1mCvr1ctsfKaP._9hTnsSqrM4SMQ6b_tNq7QQHsysg1qM14mLsADfJLF2DZmVIYIPDpo hK15cCGe_JhidaJ1Vxt5O07TuhoshHRCrQ3eaa0gkp6dnbqceRgKRWuaLKDL7L6ovGban7n4UzFvdWWp x4TDgNxgLv3ehjmTj0.Hnh1lHKWL6cG6iJ0E1xjY_jfBAX3d2cwKpgTDV_AI8T25LElgA_upWicMBpj_ OjZ9sk9asfCbAOTXnQ--
It's likely the hacker sent spam to your Yahoo-account email addresses, without accessing your Mac Address Book. (Most of the time it's hard to tell, because you probably have many of the same addresses in both lists.)
Next, change your password on EVERY account.
Make certain that every site you visit as a registered user has a unique account name and password.
Yeah, that can be a lot to manage.
Let your Mac 'Keychain' help manage all that information by remembering which user ID and which secure password goes where. There are password manager programs for sale such as 1Password. I don't currently use it, so I can't recommend it.
In my experience, there is ongoing and widespread 'hacking' at Yahoo, Hotmail, and other popular free email accounts. Why? Because most free email accounts permit unlimited unsuccessful login attempts and never 'lock' accounts for suspicious activity the way banks and brokerage firms do.
So far, the hackers are primarily using the accounts send out 'spam' to your trusted email list.
Hacking most often occurs when someone discovers or guesses the password to the email account, and it's about 99% certain that it had nothing to do with your MacBook, or any malware or virus on your physical computer. No, it doesn't hurt to run a virus and/or malware scan, but it is 99% unlikely you'll find anything harmful to OS X. You may discover a few of your incoming email attachments DO contain Windows viruses and malware!
Virtually everyone I correspond with via a free Yahoo account has been 'hacked' in the last six months. Three Yahoo friends sent me the same 'no subject' email with a surreptitious link to a FoxNews video about weight-loss in the same day!
When thousands or millions of passwords and/or account names are revealed and posted online (as documented here:http://www.latimes.com/business/technology/la-fi-tn-eharmony-hacked-linkedin-201 20606,0,4578300.story ) enterprising hackers worldwide will begin systematically testing them everywhere.
If your email address is widely-used and widely-published and your password is not very secure, every account you have is eventually vulnerable.
DO USE a combination of upper and lower-case letters mixed with numbers and permitted punctuation that does not contain common sequences, names, or dictionary words.
If you don't want to buy software, use the first letters and numbers of phrases that are easy for you to remember, but meaningful only to you. The longer the phrase, the better:
MyLimeGreen72DodgeDartHadA340Six-PackEngineAndATorque-FliteTranny!
MLG72DDha340S-PEaaT-FT!
Of course I don't actually use that, but yeah, there are still a few of those cars around: http://www.youtube.com/watch?v=kUk0jdmAKzM

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