Below are the recommended email server settings (SMTP mail server) for Yahoo users.
Generate an App Password in Yahoo
Sign into Yahoo and go to your Account security page.
Click Generate app password or Manage app passwords.
Select “Other“ from the drop down menu and click Generate.
Copy the password and save it somewhere.
With this new app password generated, you can now add set up the email server in Method.
Setup Yahoo Server in Method
Email Server if using Yahoo!: smtp.mail.yahoo.com
Email Server if using Yahoo! Plus: plus.smtp.mail.yahoo.com
Email User Name: typically your full email address.
Email Password: the password generated in the previous section.
Port: 465 or 587
Use SSL: Ensure SSL is checked. This is a security feature common for email servers.
Click Test and wait for on-screen confirmation.