This article will teach you how to forward a copy of a received Yahoo email to someone who did not receive the email in the first place. You can manually forward Yahoo emails with both the mobile app and the website, but unfortunately automatic forwarding with Yahoo Mail is no longer possible.
Steps
Method 1 of 2: On a desktop computer

Step #1. Open Yahoo
Go to https://www.yahoo.com/. You will now open the Yahoo home page.

Step #2. Click on Mail
It's the purple letter icon in the top right corner of the website. You will now open your inbox if you are already logged in to Yahoo.
If you're not already signed in to Yahoo, enter your email address and password when prompted

Step #3. Open an email
Click on the email you want to forward.
If there are multiple replies to the email, click the specific reply you want to forward first

Step #4. Click on Forward
You will find this link below the email. This opens an answer field.
To forward the mail you can also click on the arrow to the right above this link

Step 5. Enter the recipient's email address
Type the email address of the person you want to forward the email to in the "To" field.
You can add multiple email addresses by pressing Tab ↹ after each email address

Step 6. Type a message
Click the white space above the "----- Forwarded Message -----" text, and type a message there if you wish.

Step 7. Click Submit
It's a blue button in the bottom left corner of the page. This will send the email to the recipient you entered.
Method 2 of 2: On your mobile

Step #1. Open Yahoo
Tap the Yahoo app icon, a white envelope on a purple background. If you are logged in to Yahoo, your inbox will open immediately.
If you're not already signed in to Yahoo, you'll need to enter your email address and password first

Step 2. Open an email
Tap the email you want to forward.
If there are multiple replies to the email, tap the reply you want to forward

Step #3. Tap on the curved left arrow
You will find this at the bottom of your screen. You will now get a pop-up menu.

Step #4. Tap on Forward
This is in the pop-up menu. An answer field will now open.

Step 5. Enter an email address
Type the email address of the person you want to forward the email to in the "To" field.

Step 6. Type a message
Tap the white space below the "Fw:" field, and type a message there if you'd like.
You don't have to type a message to forward the email

Step 7. Tap Send
It's in the top right corner of the screen. This will forward the email to the recipient you entered.