A drugs company is using my email account to send spam?

You may have opened an infected mail or an attachment. Some new malware can install itself just by opening it, without even clicking a link! (It only takes a few hours to crack an 8-character password!) If the mail goes to your Contacts list or you receive Mailer Daemon bounce-backs, you have had your account hacked temporarily - all they wanted was your address list. The mails will stop when they move on to spam other victims.

Deleting your account or Contacts List will NOT stop this spam - once the spammers have the address, they will continue to use it for a while. Spam sent to your Contacts will also stop in a while, but it is annoying.

1. Check that the alternate e-mail address is still yours (Change it first!), and then change both your password AND your secret questions and answers. Make them unique and strong ones! (*** Changing your password also deletes the cookie which apparently inserts that sly trojan address grabber. ***) If you have a Yahoo! account, you can change your password at https://edit.yahoo.com/config/change_pw. If you can no longer access your account, you can get a new password at https://edit.yahoo.com/forgotroot/ If you still can’t access your account after going through the “Forgot Your Password” process, you may contact the Customer Care team for assistance. Click Help, then Customer Care, then Live Chat - it make take a while, but a human answers! You will be asked several questions to verify that you are the owner of the account.

If you used this password for other accounts, change them too - make every one different. Make the password longer than 8 characters, with mixed symbols.

Usually, this is all you need to do, although mail will still be sent in the name of the old account for a while.

2. *** If spam mail was sent to any of your contacts, apologize, and notify all your contacts NOT to open short e-mails, especially those with no subject, and definitely not to click any links. Warn them to scan for malware too, just in case. Set up an alternate 'alias' account to use instead. This allows you to use a different address for sending, but still keep all saved mails and contacts and the first address active too for incoming mail. Your friends can trust this new address. (There is a choice of address in an arrow in the From: box.)

http://edit.yahoo..com/config/list_alias (alternate address)

3. To be sure your computer is not infected, run both an anti-virus and spyware/malware scans, updated and separately - even more than one malware scan, or Trend Micro's Housecall for an online a-v scan. (in 'Safe Mode with Networking' is the only truly effective method - click F8 repeatedly when the screen first lights on boot-up, then arrow keys and Enter to navigate.) Re-boot into Safe Mode for each separate scan.

http://housecall.trendmicro.com/

http://www.malwarebytes.org/products/malwarebytes_...

http://www.superantispyware.com/

This is not a drugs company accessing your account. You probably have malware on your computer that is sending this out - either because you opened some infected email or you visited some infected website. Read Yahoo's page about Malware

http://help.yahoo.com/kb/index?y=PROD_MSNG&page=co...

You need to follow the steps below and it will stop

1 - Run a full scan for viruses AND malware. A virus scan alone is not enough. You also need an anti-malware program like Malwarebytes which you can download for free if you don't have it

2 - After running the scan and deleting any infected items, delete your browsing history and cookies and empty your cache

3 - Restart your computer

4 - once your computer reboots, then log into your email account and change your email password

Tell all of your friends that your account was compromised and not to click on any links in the emails being sent out - if they do their computer will become infected and all of their contacts will be spammed

It may not be YOUR fault, meaning YOUR PC or webbrowser was not necessarily compromised: This morning the same thing happened to me, and the Yahoo Login log shows I was logged in at 8.29 am using Messenger. That cannot have been from any of my PCs: First, I was on the highspeed train to Munich at that time (offline), and second, I never use the Yahoo Messenger. So the problem was/is all on the Yahoo side. I noticed that as of this morning I have to solve a captcha when I try to send email from Yahoo Mail... seems the problem is widespread.

Your account got compromised. First change your password. Account help.http://help.yahoo.com/l/us/yahoo/acct/in%E2%80%A6 for just about anything to do with your account. Then run anti Virus and Anti Spyware. Should be fine then.

See if my answer to another question works for you. Link below

Contact their email company if you can figure out what company they use.