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    Error message 17099 with Entourage

    The addresses work fine when I send to only one so I know my email is sending and I am sending to a valid email address. But when I try to send to a group of only 5 recipients, I get the error. I am running out of ideas. Thanks, A different Cathy
  2. C

    Microsoft Entourage: Error 17099

    I tried both suggestions with no luck. I received this message with the last idea: Authentication failed because Entourage doesn't support any of the available authentication methods. I am trying to send from my Mac address book to a group and have already tried to reduce the group size...
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