My Yahoo mail has many returned/failed email receipts from people I didn't email. Why?
552566
either you had a virus and it sent everything out through your email and these are the returns (unlikely) or someone spoofed your email address and all the email they sent out is being returned to you (more likely)
504261
A while back, a friend of mine (on AOL) wasn't recieving my emails because her account was set to only recieve emails from people in her address book.  Check in the account's settings, you can probably change it.
135591
Yahoo mail generally does not get "hacked"  Odds are like 1 in a billion.  Bet someone you know had your password.  Possible someone insecure???
356866
sounds like you may have been infected with a virus or spyware\n\nsome virus's tend to manipulate your email and send out malicious emails you other people in you address book\n\nensure that you have a good virus checker and that you have a spyware sweeper too\n\nhave a look on www.download.com for each - some a free\n\ngive your system a scan \n\nalso ensure that you systems firewall is on - or get a separate on - a good program that bundles all of these together is - zonelabs pro - www.zonelabs.com
134887
yahoo don't have virus. viruses are sent through weird e-mails with attachments.
32544
the email address u r using might be ok but u should go to ur junk or bulk folder and check for the mail. u might have blocked it accdently.
510585
TOO MANY REASONS TO LIST WITH NO CLEAR DETAILS GIVEN--GENERALLY--TWO STRONGEST PROBABILITIES (a)PROBLEM WITH YOUR SERVER  (b) PROBLEM WITH YOUR ADDRESS LINE (eMAIL IS EXTREMELY CASE SENSATIVE) be very sure of exacts in addressing to the smallest detail
1008263
C ur bounse mail... what he says...\n\nThere may be only two possible reasons .. first.. u may put the wrong email id ... so just crosscheck...\n\nSecond, sometimes ur recepeint mail box is full.. then those mail bounse back to u .... So check it with your recepient\n\nCheers\nRishi
746995
It seems as if the Yahoo techs may be performing upgrades currently.  I'm having a different problem with composing email at this time (ie: there's no active area block to type the message in).  The last time this happened, the techs were upgrading the system, but didn't have the courtesy to send out an alert email indicating the system would be down.  It appears that some people never learn from their previous mistakes.
1074053
Do you receive any emails at your yahoo email account at all? Say if you send yourself an email, are you able to get it? How about doing a search of 'ebay' to see if the mails are in some other folders. \n\nI also suggest you contact Yahoo Mail customer care:  http://help.yahoo.com/help/us/mail/ , where there is a link near the end of the page.
446277
You probably have an email virus of some sort. I had to change my email address because of this, the emails weren't to me and it was using my email address to send junk to other people. Then one day I got about 100 emails from people saying- STOP SENDING ME THIS STUFF, LEAVE ME ALONE, etc. because my email address was being used. I don't know how this works but it is annoying!
340061
When you get mail from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that a message that you sent was undeliverable and has been "bounced" back to you. These messages are produced automatically and usually include a reason for the delivery failure. \n\nBounced messages normally consist of two parts. The first contains the reason for the bounce; the second contains your original message. \n\nThe most common reason for a failed delivery is that the email address you entered isn't valid. If the Mailer Daemon says that the account doesn't exist, double-check the spelling of the address you entered. A single misplaced letter can be enough to cause a failed delivery. If the message continues to bounce back to you, you should verify that the account hasn't been closed or moved. \n\nYou could also check your security software on your computer. Try disabling them and try to see if you can send an email.\n\nIf there's a different reason given and you would like your ISP to investigate it, please let them know. If you can copy and paste the reason given for the failed delivery into the message you send to them, it will be very helpful as they attempt to determine why your message bounced.
331317
mailer daemon and failure notices are caused by you sending messages to email adresses that do not exist, or doing something that is not allowed by your basic yahoo account.\n\nAre you sending a lot of messages to every single person in your address book? In the mailer daemon letters it says the error, and if it is an inexistant email adress, try deleting that and the errors might go away.
110106
Your mail matches conditions set up in a filter, whether it's your account, domain, content, etc., and the receiver is bouncing it. \n\n"CAUSE:\n\nThe receiver has set-up filters on their email account. Your (the senders) email matches specific conditions set by these filters and therefore the message has been rejected based on the receivers preferences."
1142510
on yahoo you receive a mail when the e-mail wasn't send.If that doesn't happen the e-mail was sent
401793
basically you've sent your mail to an invalid email address and mailer daemon just notifies you that the message was not sent. :)
250924
The others are correct that Yahoo! Mail does not allow for read receipts. However, even for programs that do allow read receipts, the recipient can simply refuse to send you the receipt.\n\nIf you sent the mail more than four days ago, and you haven't received a failure notice for the message, it got there; it might have been deleted, or corrupted by his mail server, but your message got there. You can't prove it was ever opened, but your message made it to his inbox if you didn't get a failure notice.