YPOPs! is a free open source software that provides POP3 and SMTP access to Yahoo! Mail. You can use your favourite email client, be it Outlook, Thunderbird, or whatever else you like and connect to Yahoo! Mail seamlessly.
YPOPs! is an application that provides POP3 and SMTP access to Yahoo! Mail.

YPOPs! is a Windows, Linux, Solaris and Mac program providing POP3 access to Yahoo! Mail.
Yahoo! Mail disabled free access to its POP3 service in April 2002. This resulted in many people (including myself) to look for alternative free POP3 services.
But this exercise can be very difficult because of the fact that your Yahoo! Mail address could be with several people and informing all of them about your new email address could prove to be a nightmare.
This application emulates a POP3 server and enables popular email clients like Outlook, Netscape, Eudora, Mozilla, Calypso, etc., to download email from Yahoo! accounts.
We do not go against the license agreements of Yahoo! Mail. This application is completely legitimate and well within the realms of legal software.

How to setup Windows Live Mail with YPOPs!:
1.Click the SHOW MENU (ALT+M) button at the top right of the WLM window then click on SHOW ALL MENUS. You should now see FILE, EDIT, VIEW, TOOLS, ACTIONS, and HELP at the top of the WLM window.
2.Click TOOLS > ACCOUNTS. Click the ADD button.
3.Select E-MAIL ACCOUNT then click NEXT.
4.Enter your Yahoo! e-mail address, password, and your name as you would like for it to appear to people you send e-mail to. Check the box in front of "Manually configure server settings for e-mail account." Click NEXT.
5.Make sure to use lower case letters for your username. The username is just the username, not the full Yahoo! e-mail address. The INCOMING and OUTGOING servers are both "127.0.0.1" (no quotes). Check the box in front of "My outgoing server requires authentication". Click NEXT then click FINISH.
6.With the ACCOUNTS window still open, select your Yahoo! e-mail account and click PROPERTIES. Click the ADVANCED tab. Move the SERVER TIMEOUTS slider all the way to the right so the server timeout becomes 5 minutes.
7.Optionally, you may or may not want to keep e-mails on Yahoo! If you DO NOT WANT to keep e-mails on Yahoo!, uncheck the box in front of "Leave a copy of messages on server". Click APPLY then click OK.
8.Click CLOSE on the ACCOUNTS window to close it.

How to setup YPOPs! and Outlook:
1.Select Tools -> Email Accounts from the main menu
2.Select Add a new email account and click o n Next
3.Select POP3 as the Server Type. Click Next
4.Enter your username and full Yahoo! email address under 'User Information'
5.Enter your Yahoo! Login id and password under 'Logon Information'
6.Enter '127.0.0.1' as your Incoming mail server
7.Enter '127.0.0.1' as the SMTP server as your outgoing mail server
8.Click o n the More Settings button and select the Advanced tab
9.Increase the Server Timeout to 'Long' (10 minutes)
10.Select the Outgoing Server tab
11.Enable "My outgoing server (SMTP) requires authentication". Select "Use same settings as my incoming mail server".
12.Click Ok to close the More Settings dialog
13.Click Next and then Finish

How to setup YPOPs! and Thunderbird
1.Click Tools-> Account Settings
2.Click Add Account button.
3.Choose Email Account. Click Next
4.Type name and email address in the boxes. Click Next
5.Choose POP and type 'localhost' as the incoming server.
6.Depending on your preferences check or uncheck Use Global Inbox
7.Click Next. If your username is not already there by default, add it.
8.Click Next. Add the way you want your Account Name to look in Thunderbird.
9.Click Finish.
10.Now scroll down to the bottom of the Account Settings pane and click on Outgoing server (SMTP).
11.Click on Advanced. Click on Add.
12.Type 127.0.0.1 as the outgoing mail server. Port default is 25.
13.Check Use name and password. This is Thunderbird's way of enabling authentication.
14.Type your Yahoo user name as username@yahoo.comThis e-mail address is being protected from spambots, you need JavaScript enabled to view it .
15.Click No to Use secure connection and then OK twice.
16.Click OK to the Server Settings window.
17.Now get back into Account Settings
18.Go back to the Server Settings of you Yahoo Account in the Account Settings pane.
19.Do not check Use secure connection (SSL) or Use secure authentication.
20.Click on Advanced.
21.Choose where you want your emails to go in the POP tab.
22.Click on the SMTP tab and click on the drop down menu and select 127.0.0.1:25
23.Continue modifying any of your preferences in the account and then click on OK.

The license of this software is Freeware, you can free download and free use this email tool software.