If you delete your Yahoo! Mail account, you also lose your Yahoo! GeoCities page, your My Yahoo! settings, your Hotjobs profile and other data in services belonging to the Yahoo! empire. If you are paying for any Yahoo! subscription services such as Yahoo! Mail Plus, it is probably best to cancel these first to avoid unexpected payments.

To delete your Yahoo! Mail or Yahoo! Mail Classic account:

• Visit the Terminating Your Yahoo! Account page.
• Type your password under please confirm your identity with your password..
• Click Terminate this Account.
• Wait 90 days for Yahoo! to delete data (such as email messages) associated with your account.

[Via: about.com]

Yahoo! Mail can block all mail from up to 500 email addresses. All mail from these senders will be automatically deleted before you see it. Instead of deleting every incoming mail manually, you can have Yahoo! Mail do the job.

Block a Sender in Yahoo! Mail

To have Yahoo! Mail delete all mail from a particular address automatically:

• Select Options then Mail Options… in Yahoo! Mail.
• Go to the Spam category.
• Type the unwanted email address under Add a blocked address:.
• Click Add.
• Now click Save Changes.

Block a Sender in Yahoo! Mail Classic

To add an email address to the list of blocked senders in Yahoo! Mail Classic:

• Follow the Mail Options link in the top navigation bar.
• Select Block Addresses, which you can find under Management.
• Enter the email address you want to be blocked under Add Block.
• Select Add Block.
• Select Yes to set the block.

Basically Yahoo! Mail is a web- based mail which uses SMTP whereas Outlook Express understands POP. So for translate your web-based Yahoo! Mail account into a POP account which Outlook Express understands, there are many tools . Among the smartest of these tools are IzyMail and YPOPs!.

Access Yahoo! Mail Account with Outlook Express Using YPOPs!

• Install YPOPs! and make sure it is running.
• Open Outlook Express.
• Select Tools | Accounts… from the menu in Outlook Express.
• Click Add and select Mail….
• Type your name.
• Click Next >.
• Enter your Yahoo! Mail address (”hmmzl34@yahoo.com”, for example).
• Click Next > again.
• Make sure POP3 is selected under My incoming mail server is a ___ server..
• Enter “localhost” under Incoming mail (POP3, IMAP or HTTP) server:.
  If “localhost” does not work, try “127.0.0.1″ instead.

• Type “localhost” under Outgoing mail (SMTP) server: as well.
  If “localhost” does not work, again try “127.0.0.1″ instead.

• Click Next >.
• Type your Yahoo! Mail user name under Account name:.
  The user name is your Yahoo! Mail address ajay”@yahoo.com”.

• Enter your Yahoo! Mail password under Password:.
• Click Next >.
• Click Finish.
• Highlight localhost in the Internet Accounts window.
• Click Properties.
• Type “Yahoo! Mail” under Mail Account.
• Click OK.
• Click Close.

Same can be done using IzyMail.