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Sending Emails Generates Error: 503 valid RCPT command must precede DATA.
Why do I receive error "503 valid RCPT command must precede DATA" when attempting to send email?
This usually is a result of the mail server requiring authentication.
If you are using Outlook 2003, here are the steps to enable authentication:
Note: If you are still having errors, make sure your login username is your full email address and that the password is correct.
- Open Outlook
- Go to Tools | Email Accounts
- "View or change existing e-mail accounts" should already be marked
- Click Next
- Select the Account with the trouble and click Change
- Click on More Settings
- Click on the Outgoing Server Tab
- Click "My outgoing server (SMTP) requires authentication" and make sure "Use same settings as my incoming mail server" is selected
- Click on the Advanced Tab
- Set "Outgoing server (SMTP):" port to 26
- Click OK and then Test Account Settings
- If everything is fine and reports no errors,
- Click Close.
- Click Next.
- Click Finish.
- If an error does occur, it will switch to the Errors tab and display the error
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