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Outgoing Mail (SMTP) Port Setup in Outlook 2003 for Windows

  1. Open Microsoft Outlook 2003.
  2. Select Tools -> E-mail Accounts from the menu.

Outlook 2003 Main Menu

  1. Select "View or change existing e-mail accounts" and click "Next".

Outlook 2003 Account Wizard

  1. Select your account from the list and click "Change".

Outlook 2003 Account List

  1. Click the "More Settings" button.

Outlook 2003 Account Settings

  1. Click the "Advanced" tab.
  2. Change the number in the "Outgoing server (SMTP) field from 25 to 587.

Outlook 2003 SMTP Port Settings

  1. Click "OK".
  2. Click "Next" and then click "Finish".