I searched the forum here and looked at the Outlook forums and couldn't find an answer to this question. I am new at all of this and am trying to set up my bluehost email on my Outlook. I can recieve my email, so the incoming works fine. When I test the outgoing part, the email test message automatically sent from MS sends successfully. However, when I try to send an email I get this error message: 503 Valid RCPT command must precede DATA . I have another account setup in Outlook and that sends emails just fine. Can you please tell me what I need to change? Much appreciate it.