Error using Outlook for Mac to send email from security groups or distribution lists

Symptoms
When you try to send email messages from a distribution list or a security group, Microsoft Outlook 2016 for Mac or Outlook for Mac 2011 times out, and you receive one of the following error message:
Error: An unknown error has occurred in Outlook.
Details: Mail could not be sent. The message has been moved to your Drafts folder.
Error code: -19991

Error: An unknown error has occurred in Outlook.
Error code: -19992

Cause
Outlook for Mac has the following limitations:
  • You cannot send email messages from a distribution list or a security group.
  • You cannot use a distribution list or a security group as a delegate.
Workaround
To work around these limitations, take the following actions: 
  • Send email messages from a single account instead of from a distribution list or a security group. 
  • Use single accounts as delegates instead of using distribution lists or security groups as delegates.


Properties

Article ID: 2739937 - Last Review: 08/10/2015 06:26:00 - Revision: 3.0

Microsoft Outlook 2016 for Mac, Outlook for Mac for Office 365, Microsoft Outlook for Mac 2011

  • KB2739937
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