You can either add an account with Yahoo! Mail's automatic delivery settings, or you can add an account and manually set the delivery options yourself.
Delivery options include:
choosing the Yahoo! Mail folder you want new messages to go into deciding whether or not emails in the other accounts should stay in those other Inboxes after you read them in Yahoo! Mail choosing to get either all your messages from the other account, or only the new ones applying your Yahoo! filters to that other mail, if you want Yahoo! Mail can't retrieve messages from Web-based email accounts like RocketMail. Also, you won't be able to access another Yahoo! Mail account that has already been set up for POP access.
Use the first set of instructions to get Yahoo!'s automatic settings. Use the second instructions if you want to manually set the delivery options.
To add an account with Yahoo! Mail's automatic delivery settings:
Click Options in the upper-right corner of your Mail page.
Under Management, click Mail Addresses.
On the “Mail Accounts” page that opens, click Add.
Enter an account name—whatever you'd like to call it. For example, "Work," "School," etc. Then either click Continue on the lower-left, or press Enter.
Enter your mail server name—the info you got from your Internet Service Provider or Network Administrator.
Enter the user name and password for that account. Please note: The user name is different than the full email address. Typically it is the text before the "@" symbol in your email address. Your password is whatever you use to access that email account—not necessarily your Yahoo! password.
Select an indicator color to mark messages received from this account. This color will highlight any messages in your Inbox that are from the other account.
Click Add Account. Your account is now added. Feel good?
To add an account and manually select delivery options:
Click Options in the upper-right corner of your Mail page.
Under Management, click Mail Addresses.
On the “Mail Accounts” page that opens, click Add.
In the upper-right corner of this page, click the "Configure Account Manually" link.
Enter an account name—whatever you'd like to call it. For example, "Work," "School," etc.
Enter your mail server name—the info you got from your Internet Service Provider or Network Administrator.
Enter the user name and password for that account. Please note: The user name is different than the full email address. Typically it is the text before the "@" symbol in your email address. Your password is whatever you use to access that email account—not necessarily your Yahoo! password.
Select an indicator color to mark messages received from this account. This color will highlight any messages that are from the other account.
In "Deliver To:," choose a folder to route incoming messages to that are from this account.
In "Options," check (or don't check) the boxes next to the following:
Override default POP port: If you know your POP server uses a port other than 110, enter the port number here. Note: To get this information, contact your Internet Service Provider or Network Administrator.
Leave mail on POP server: Specify whether messages retrieved to your Yahoo! account will also remain in your external mail account, or whether you want them deleted from your external mail server.
Note: Checking this box means that you intend for mail to stay in your external account AND in your Yahoo! account. If you do not check this box, the mail received from your external mail account to your Yahoo! Mail account will be deleted from your external mail account
Retrieve new messages only: Specify whether Yahoo! Mail retrieves only the new messages in your external mail account, or all messages.
Note: Checking this box means that your old emails will stay in your external mail account and only the new emails received to your external mail address will be sent to your Yahoo! account. If you do not check this box, all old and new emails to your external mail account will be sent to your Yahoo! Mail account.
Use filters: Checking this box applies Yahoo! Mail filters to incoming external mail.
Click Add Account. Your account is now added. Yes!