Why would I be receiving Failure Notices on outgoing e-mail?

Your account has been 'compromised' and is being faked or 'spoofed' by spammers. Yahoo's advice is to change your password, but there are several more security settings to change than just your password. This Help page has more information, stated clearly, with several links to clarify the steps.

http://help.yahoo.com/kb/index?page=content&id=SLN...

1. FIRST, check that the alternate e-mail address/mobile phone number is still yours, under Options, Mail Options, Account Information, but then change it! (so the hacker will not be notified of the change). Check the 'Reply To:' address as well ...

Then change both your password AND your secret questions and answers. Make them unique and long, strong ones with mixed characters! Go to "Update password-reset info" to change your Secret Questions and Answers ...

*** Changing your password also deletes the cookie which apparently inserts that sly trojan address grabber ... ***

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

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

For 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/

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 change their passwords and 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. Also add a signature to your mail so your friends will be sure the mail is really from you ...

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

3. Just to be very sure your computer is not infected, (which is very unlikely, but a wise thing to do),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.

If you cannot download to your own machine, download and save on a clean computer, and transfer the executable file to a flash drive to use for your own ...

*** 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. Instructions can be found here too ...

http://www.getwellsooncomputer.com/

These are the best free anti-malware programs for cleaning infections, and can be installed without conflict with other security programs ...

http://www.malwarebytes.org/products/malwarebytes_... (update before running)

and any one of these ...

http://housecall.trendmicro.com/ (no installation - just run!)

http://www.bitdefender.com/scanner/online/free.htm... (no installation - just run!)

http://www.eset.com/us/online-scanner/ (no installation - just run!)

http://www.superantispyware.com/ (also free, update before running)

4. Delete all System Restore points from Control Panel > Recovery (or System Restore in XP), Once clean, re-boot and create a new restore point.

5. Then delete cookies, cache and history in case the malware can 'self- reproduce'. Click Ctrl + Shift + Delete at the same time to do this all at once.

Answers is a Jungle

Someone has hacked into your account and is using your address to send out spam

Change your password.

They are using computer generated addresses like

yellowrose1@ yellowrose2 yellowrose3.. etc.. The good addresses go thru

and youre getting the return notices, on addresses that dont belong to anyone.

It also appears your opening spam email.

There's a reason there is a junk spam folder. Its because you should

never open, reply or unsubscribe to spam.

It has viruses, spyware, tracking, scams.. unwanted ads.. often with links to sites

than have viruses, spyware. Sites that put files on your computer to track you..or

snag your passwords....and so forth.

I hope you changed your address recently because you wanted to and not

because you got some email telling you to.

All mail that "appears" to be from Yahoo..isnt always from Yahoo.

Anytime you get an email, with a link that takes you to a log in page..you have

an email from a hacker, thats trying to obtain control of your account.

Yahoo never asks you to update, confirm, or do anything with your account

No one legitimate will EVER ask for your password.

Try to get control of your account back here >

http://help.yahoo.com/kb/index?locale=en_US&page=c...

You should also run a virus scan- sounds like you have trojan viruses

sounds like the settings for your outgoing server are wrong.

sorry, can't make a suggestion.