Send test e-mail message: Your outgoing (SMTP) e-mail server has reported an internal error.

Reported error (0x800CCC65) : 'Your outgoing (SMTP) e-mail server has reported an internal error. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 503 valid RCPT command must precede DATA'

1. Open Outlook.
2. Go to Tools > Email Accounts.
3. Select the Account that is causing you trouble and click “Change”.
4. Click on “More Settings.”
5. Click on “Outgoing Server” tab.
6. Click "Outgoing Mail Server (SMTP) requires authentication" and make sure "Use same settings as incoming mail server" is selected.
7. Click on "Advanced Tab".
8. Set “outgoing Port (SMTP)” to 587.
9. Click “OK” and then Test Account Settings.