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503 valid RCPT Command Must Precede DATA Outlook 2007

Discussion in 'E-mail Discussions' started by thanasis, Jan 8, 2018.

  1. thanasis

    thanasis Active Member

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    Hello all,
    i have problem with all clients using Outlook 2007, they can't send email...
    I have returning emails with error "503 valid RCPT Command Must Precede DATA"
    This is not happend at Thurdirbird...
    At outlook settings i have got "Log on to incoming mail server before sending mail".
    I have at SMTP port 25...
     
  2. Infopro

    Infopro cPanel Sr. Product Evangelist
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