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Outlook Error 0x800ccc78 – Unable to send email to multiple people in the CC field

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    Ackmal
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    #163831

    Hello Members,

    I’m facing a problem with my Outlook 2007. When I try sending an email to multiple recipients it just does not go through.

    Error: 0x800ccc78 451 temporarily unavailable.

    If I enter multiple email ids in the TO and BCC field the message goes through fine, however if I do the same with the CC field it gets stuck.

    I tried the following:
    Disabled Anti-virus and firewall.
    Created new outlook profile.
    Repaired Outlook 2007
    Ran scanpst.exe
    Checked the POP and SMTP server names, port numbers and authentication options and they are all fine.
    Configured another email account of mine in the same outlook and everything is fine.

    I’m using windows 7.

    What do you recommend I do other than re-installing outlook.

    Thanks in advance.

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