Yahoo SMTP Email Settings
Server: smtp.mail.yahoo.com
User Name: Your Yahoo email account
Password: Your Yahoo email account password
Port: 465 or 587
TLS (SSL): Must be checked
From: Your firm email address <example@yourdomain.com> (must be a valid email address)
Additional Yahoo Email Settings Requirement
Yahoo requires that you follow these steps to set up the email address you used in the Email Settings From field as an alternate email address in your Yahoo account.
From your Yahoo email account, hover over the sprocket
button located in the top-right corner and click Settings:
Under Settings,
click Accounts and then click
Add. Enter the email address
and a description and click Save.
A verification email will be sent by Yahoo to the email you have just added. Open it and click the link provided to finalize the process.