If you want to delete your unused yahoo account then follow these steps

Go to https://edit.yahoo.com/config/delete_user
Login using the yahoo account ID that you want deleted.
When asked for the password once again,enter it, and click on “Terminate this account”. And it will be deleted

This is a step-by-step illustrated guide on how to enable mail forwarding for Hotmail.
This is very useful when you have so many email accounts and you want all emails to be forwarded to a single email address.

Step 1 ) Login to the hotmail account that you wanted to forward incoming emails to another email account.

Step 2) Click Options at the upper right corner of Hotmail Windows, as shown in the picture below



Step 3) Select Forward mail to another e-mail account, see picture below



Step 4) Select Forward your mail to another e-mail account , and fill in the forwarding address at the box provided.



Step 5) Finally Click Save, All emails received by this email address will then be forwarded to the email address specified in step 4.

This is a step-by-step illustrated guide on how to enable mail forwarding for gmail.
This is very useful when you have so many email accounts and you want all emails to be forwarded to a single email address.

Step 1 ) Login to the Gmail account that you wanted to forward incoming emails to another email account.

Step 2) Click on Settings located at the upper right corner of the gmail window.




Step 3) Select Forwarding and POP/IMAP by clicking on it.



Step 4) Select Forward a copy of incoming mail to and type the email address that will receive the forwarded emails. Also in the box beside the forwarding address you can choose if you want Gmail to keep copy of the forwarded emails or delete it after forwarding



Step 5) Click Save Changes, All emails received by this email address will then be forwarded to the email address specified in step 4.