503 Valid RCPT command must precede DATA

3 years ago / Blog 0

503 Valid RCPT command must precede DATA

You can resolve the error ‘503 Valid RCPT command must precede DATA’ as folows:

  • In Outlook, click File
  • Click Account Settings > Account Settings
  • Select your email account.
  • Click Change…
  • Click More Settings…
  • Select the Outgoing Server tab
  • Check My outgoing server (SMTP) requires authentication
  • Select Use same settings as my incoming mail server


  • Select the Advanced tab
  • Change Outgoing server (SMTP) to 465
  • Set Use the following type of encrypted connection to SSL


  • Click OK
  • Click Next

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