For each listed recipient, you see the following error message:
Under the diagnostic information for administrators, the following error is generated for each listed recipient:
When you open the meeting on the calendar, the To field contains a number of the recipients in the distribution group membership, in addition to the distribution group itself.
Disable responses for the meeting requestWhen you send a meeting request to a large distribution group whose membership exceeds the established recipient limit for your organization, turn off responses from recipients:
- In the new meeting window, select Response Options on the ribbon.
- Clear the Request Responses check box.
This prevents responding recipients from being added to the To field on subsequent updates to the meeting. This also prevents the tracking of meeting responses on the meeting's Tracking page.
Note In some cases, clearing the Request Responses check box may not completely eliminate recipient responses from being returned to the organizer. This behavior may still occur if the recipient accepts the meeting invitation from a device or a non-Outlook client that does not honor the disabled Request Responses setting. This behavior is known to occur with certain third-party implementations of Exchange ActiveSync (EAS.)
Manually delete additional responses before you send the updateWhen you reopen the meeting to send an update, delete the additional recipient entries from the To field before you click Send Update.
Note When you use this method, removed recipients may receive a cancellation notice for the original meeting, and the update may be applied as a new meeting on the recipient's calendar.
Exchange Online and Office 365 have an organization limit of 500 recipients per message, and this setting cannot be modified. Where applicable, this value is configured through the following PowerShell command:
The MaxRecipientEnvelopeLimit parameter specifies the maximum number of recipients for a message. The default value is 5000. The valid input range for this parameter runs from 0 through 2147483647. If you enter a value of Unlimited, no limit is imposed on the number of recipients for a message. Exchange treats an unexpanded distribution group as one recipient. This parameter is available only in on-premises installations of Exchange 2013.
For more information, see Set-TransportConfig.