Why do my emails not sending right?

Why can't i send emails? and what is the right isp for sending emails?

• Answer:

  In an attempt to control unsolicited email (spam), some Internet service providers block port 25. If you experience technical problems sending email, then you need to use port 587 when sending via Yahoo!'s SMTP server. To make this change, please select from the list of supported clients: Microsoft Outlook 2002 (XP) and 2003 From the "Tools" menu, select "E-mail Accounts." Select "View or Change existing email accounts" and click "Next." Select your Yahoo! POP account and click the "Change" button. Next, click "More Settings." Click the "Advanced" tab. Next to "Outgoing server (SMTP)," change port 25 to 587. Click "OK," then click "Next" and "Finish." and Restart Outlook.