If you are a yahoomail user that would want to forward your yahoo mail messages to another email address such as Gmail, GMX, Yandex mail or Yop mail, You don’t need to be bothered because it is very easy and less time consuming to forward your new messages from your yahoomail address to any email your choice.

The truth and the fact are, Whenever you forward Yahoo Mail messages to a new email account of your choice, it doesn’t stop you for accessing your yahoomail account but rather you can still be able to log in to Yahoo Mail account anytime you want. The Yahoomail forwarding process will only help you to receive all your yahoomail messages in one place .

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Steps on how to Forward Yahoo Mail to Another Email Address
kindly follow below steps to forward yahoo mail to another email:-

Visit Yahoomail login page on web.
Login Yahoo account to get started.
Move your mouse over the gear icon on the far upper right corner of the page, next to your name.
You will then Choose Settings from the menu that appears.
Select Accounts from the left.
Then click the email account that you would want your yahoo mail messages to be forwarded from (On the right, under the Email addresses section)
Now Scroll down to the section “Access your Yahoo Mail elsewhere” then put a check in the box next to Forward.
At this point, you can then Enter your prefered email address that all of your incoming Yahoo Mail messages should be forwarded to.
select Store and forward or Store and forward and mark as read. (Below the email address)
Now you need to verify it by Clicking the Verify button
Now log in to the prefered email account you want your email to be forwarded to.
Finally, Click Save from the bottom of Yahoo Mail’s Settings window and your future yahoo mail messages will be forwarded to your prefered email address.

Source :http://www.viralvista.net/how-to-forward-yahoo-mail-to-another-email-address/