For more information about Office 365 Groups, see Learn about Office 365 Groups. Only this user has reported this issue, thankfully. There was a post about SSL-related issues with Outlook 2016 but sounded like a hearsay. There was a mention of a Charter/Spectrum issue on Outlook for Mac 2019 but my user's ISP is neither of those and he's running Outlook 2016. To work around these limitations, take the following actions: I couldn't find a clear solution from Microsoft or Apple forums. 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.
