Yahoo

If you want to use Yahoo Mail as the primary mailbox, log in to your Vendor account. In the menu at the top of the page, click 'Options' and select 'Options' again. Click 'Email Account' located on the side menu and from there you can add more accounts.
       . Some great tips in Yahoo! Mail
       . Turn on 2-Step Verification for Yahoo! Mail
       . Yahoo + AOL = Oath
Click the '+ Add' button and you'll be prompted to enter a name for the account and email address. Gmail and Outlook make things easier because they automatically create settings, but with Yahoo you have to enter the POP settings for each of your accounts.
After saving the settings, you should also receive a confirmation email sent to your secondary account - possibly your Yahoo account. Just like in Gmail and Outlook, you can select the "send from" option using the drop-down menu in the new email editor.