⏩ Automatically Forward Yahoo Messages
You can automatically forward all incoming Yahoo Mail messages to another email address. This is useful if you want to forward emails to another inbox or to your Parsio Mailbox for processing.
Automatically forward all messages
Open Yahoo Mail and sign in to your account.
Click Settings (the gear icon), then select More Settings.
Open the Mailboxes section.
Select your primary mailbox account.
Under Forwarding, enter the forwarding email address.
Click Verify.
Log in to the forwarding email account and follow the verification instructions.
Useful link
Official Yahoo guide: Enable automatic email forwarding in Yahoo Mail