If you use Yahoo Mail, you can use the service's online portal to send, receive, organize, and manage your email through another client of your choice, such as Outlook. This allows you to manage your email accounts from a single application. Here you will find the SMTP settings that you can enter in your favorite email program.
Yahoo SMTP Settings: How to Connect an Email Client or WordPress Site
The SMTP server settings apply to outgoing mail, so they are the same whether you use POP or IMAP for incoming mail. In most cases, you will enter the SMTP settings in the Settings section of your email client when you add your Yahoo account to it.
Here are the details you need to enter into the email program to send Yahoo Mail:
These settings work with most desktop, mobile, and web email programs and services (for example, Outlook and Gmail). After you set up Yahoo Mail in your favorite email client, your email and Yahoo folders will appear in both locations.