You can't send email messages from a distribution list, a security group, or a mail-enabled Public Folder.Outlook for Mac has the following limitations: The message has been moved to your Drafts folder.Įrror: An unknown error has occurred in Outlook. When you try to send email messages from a distribution list, a security group, or a mail-enabled Public Folder, Outlook for Mac 2011, Outlook 2016 for Mac, or Outlook for Mac 2019 times out, and you receive one of the following error messages: Error: An unknown error has occurred in Outlook.ĭetails: Mail could not be sent.
