Your Server

The message could not be sent because the server rejected the sender's e-mail ...?

The message could not be sent because the server rejected the sender's e-mail address. The sender's e-mail address was 'BKRENNING4@COMCAST.NET'. Subject 'Fw: howdy', Account: 'Laptop', Server: 'smtp.comcast.net', Protocol: SMTP, Server Response: '550 5.1.0 Authentication required', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC78

Public Comments

1. You probably won't be able to use a FREE Yahoo account in that way. Here's the settings for the PAID version Yahoo Mail Plus: Incoming mail server settings * POP server: plus.pop.mail.yahoo.com * Use SSL * Port: 995 Outgoing mail server (SMTP) settings * SMTP server: plus.smtp.mail.yahoo.com * Use SSL * Port: 465 * Use authentication * Account Name/Login Name: Your Yahoo! Mail ID (your email address without the "@yahoo.com", for example, “testing80”) * Email Address: Your Yahoo! Mail address (for example, testing80@yahoo.com) * Password: Your Yahoo! Mail password Upgrade first by clicking Options > Mail Plus > Upgrade Now > enter your payment details for annual fee of $19.99