some one is sending out spam email using my yahoo email address to all my contact list how can I stop this?

Although there is a possibility you were 'hacked', it is far more likely that your address was compromised by one of the powerful spam bot networks. They have the ability to crack passwords, especially weak ones. They can also 'spoof' the addresses in the From: area to make it more likely that they will be opened. Spammers have programs just to 'harvest' e-mail addresses. Your account has been seriously compromised, and more of this type of letter will keep happening. It may not even be your own computer that was infected. Nonetheless, act promptly!

Of course, a thorough scan with anti-virus and a couple of good anti-spyware programs in Safe Mode is an obvious suggestion. But you need to do more!

Carefully read the technical advice given by guru Leo Notenbloom in his columns - they are the best, most-detailed I have ever read. Read especially #1 and #3 BEFORE you set up a new safe account! Yes, you will probably chose to open a new account, but transferring your contacts and saved mail is time-consuming. Changing your password is NOT sufficient! Use a very strong password (letters, capitals, punctuation, symbols - the longer the better) Change your 'Secret' Questions and Answers too - ones that nobody could guess - Yahoo even allows you to invent your own questions.

AFTER you have read the advice, and copied your Contacts list, you should use the new account to contact everyone with your new address, including your name and 'new address', as well as an apology to them. Urge ALL of them to use BCC: and delete all addresses when forwarding mail too!

https://edit.yahoo.com/registration?.int%E2%80%A6

http://edit.yahoo..com/config/list_alias%E2%80%A6

Most of the time this kind of thing is caused by the spammer having obtained the password by using phishing spam. It is a good idea to scan for viruses and spyware, too.

To change your password, log into Yahoo mail and go to:

Options

Mail Options

Account information

You will be asked to give your password again. This is safe as long as you started from a proper Yahoo login, not a link from within a spam or other link.

From here you can change your password. However, you also want to look at the Contact Information.

You should find a Yahoo! Email that agrees with your account name. You may find a Home Email. This is an alternate contact address. There should not be one unless you entered one. If you find an unfamiliar one it could have been entered by the spammers. If they have inserted a home email under their control, they can report a "forgotten" password and collect the new password at that address.

You should avoid posting your email address publicly. Posting it can increase the number of spam lists that harvest it. The spambots use the kind of webcrawler technology that enables search engines to index the Yahoo Answers questions.

Another precaution that can help is to copy your address book to text, and email a copy to yourself. Keep a backup copy in case the spammer empties your mailboxes. Clean out the address book. This has the inconvenience of requiring you to copy and paste as needed to send email. A spammer with your password could possibly find your address list in your email. However, most of the time the address-book-abusing scripts are pretty automated, so a spam to an empty address book could be a spam to no one. You could include your own address in the address book just to see if a spammer is trying to abuse it. Such an incoming spam could be confused with a spam that forges recipient as sender. However, a spam to yourself from your own Yahoo account will probably display your real name as sender. The forged address as sender will probably identify the sender as the address.

If you do want to solve a problem by starting a new account and abandoning the old:

Test the new account for satisfactory function. You can send email to yourself.

Forward important emails to the new address. Check the new account to be sure they arrived.

Empty all mailboxes and empty the Trash.

Empty the address book.

Sounds like your E-mail account has been compromised, or you picked up a virus, Stretch.

Immediately have your computer checked for a 'bug' or 'bugs.' If you have the proper programs, do the scans yourself, if not you need to take your computer to some one who can.

Once it is clean of pests, install a firewall and an anti-virus program if you do not have one yet.

I strongly recommend a program for malware and adware also.

After you finish this, then go in and change your password, using a good strong one.

Also, check your account information and make sure no information was changed, if it was change it back immediately.

Then, you will have to inform your contacts that it was not you sending that mail, but they need to check their computers in case they were also infected.

Change your password

NO! That's not even CLOSE to what I asked. Are you brain dead??