What kind of upgrade?

If someone sends a email to your "deleted account" it will bounce back to the sender with some kind of a undeliverable message, such as "account does not exist" or may be just "undeliverable!". The error message the sender will see depends on wich mail server or service they use.

my understanding is that you need to have yave yahoo plus to get this to work, yahoo plus is the paid version for you to have pop access which means be able to use an email client (like outlook) to retrieve yahoo mail there.
now if you have not paid for yahoo plus you can do the following:
1. switch your yahoo account to be localized to asia, which should also (for now) allow you to use pop access on a free yahoo account, you need to look around into the account options (Its under Account Info, Account Settings,Set Language Site and Time Zone or something like that)
2. once 1 has been completed go into yahoo and add your yahoo account, * for logon info use only your yahoo user name (not the @yahoo.com) * enter your correct password *for incoming email server: pop.mail.yahoo.com *for outgoing email server: smtp.mail.yahoo.com
3. go into more settings>advance * incoming server port should be 110 *outgoing server port should be 587
good luck

If you have Yahoo! Mail Plus (a paid upgrade), you can access those messages directly from a standard email program (such as Outlook, Windows Live Mail, etc.). You need to configure the account settings in your email program for the Yahoo service.

The settings for incoming mail are:
Incoming (POP) server: plus.pop.mail.yahoo.com
Port: 995
Security: SSL

For more on Yahoo server settings, see this Yahoo help page:
http://help.yahoo.com/l/us/yahoo/mail/yahoomail/mailplus/pop/pop-14.html

For details on configuring the WLM email program, see this Microsoft help page:
http://windows.microsoft.com/en-US/windows-vista/Windows-Mail-setting-up-an-account-from-start-to-finish#section_5

and this additional page on port & SSL settings:
http://support.tigertech.net/windows-live-mail-ssl

Program Files \ Yahoo! \ Messenger \ Profiles...

Im sorry to say but, you cant retrieve your chat archives from yahoo mail. but you can only retrieve it in Yahoo Messenger.

In order to set the settings in Yahoo Messenger so that you can retrieve the chat archives for future reference,

First..
go to messenger > preferences > Archive > and choose Yes, save all of my messages.

This sets your yahoo messenger application to save all your chat messages even when you logout or close the application.

If you want to retrieve your chat archives, click the View Archive button


:) well i hope this solves your problem..

Update your Yahoo this will solve lots of issues

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I believe you have chosen 1 type of account and now because you have done it yourmail plus account is not available you will have to go to yahoo site and search for an answer
I have found that if a program works the way you want do NOT upgrade it as problems can occur and files lost

wat's ur major problem..?
if u think ur a/c really hacked,my better advise is...backup all ur mails,drafts,sent mails to another mail id..
if u have any other mail id..try to login with that id..
i think it is msngr problem not ur id's..upgrade ur classic mail to yahoo mail+. so u can chat with ur online frnds...

This is a very common problem. Upgrading you iphone firmware if it's not current may solve this problem. Or try changing your address for the account from [email protected]" to your yahoo id without the "@yahoo.com"

Otherwise the built-in yahoo option for iphone can be buggy:

1. Delete the Yahoo account on your iphone
2. Create anew account via Other option
3. Fill in the usual user id and password fields
   
4. Under IMAP tab set Host Name under Incoming Mail Server to imap.apple.mail.yahoo.com
5. Under Outgoing Mail Server, in Host Name field set it to cwmx.com

If you have a very large yahoo inbox, you may have to do the following:

1. Go to your yahoo account in a regular browser on your computer. Makesure you're using the new version of Yahoo mail (the one that looks andfeels like outlook).

2. Create a new folder. I called mine "archive - inbox".

3. Select ALL emails in your inbox so that your inbox folder will becompletely empty once you move them (there's a box you can check whichwill select everything). I had over 5,000 emails in my inbox, so thiswould have taken ages using the Classic version of Yahoo mail.

4. Move all emails to your newly created archive folder. Go back intothe archive folder and select any unread/new emails and move them backto your inbox.

5. Go into Yahoo on your iphone and refresh the mail. This will clearout the old emails and download the most recent emails from your inbox.

More info here: http://discussions.apple.com/thread.jspa?messageID=7926883