Delivery has failed to these recipients or distribution lists - When meeting request

[genesis]

Hi

We use exchange 2007 and outlook 2013 .Our PA to the principal have the access to the principal calendar. After opening the principal calendar from her PC and Right click a free slot on the calendar –New appointment and invite Attendees and send the meeting request. She gets and error Delivery failed to these recipients or distribution list.

Do I need to give any permissions for the PA .Please see the Diagnostic information for administrators attached.

 

The user gets Delivery has failed to these recipients or distribution lists:

There's a problem with the recipient's mailbox. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.

________________________________________

 

Any help will be great.

Diagnostic info .txt

[genesis]

PA must be able to send the meeting request any staff. We have 100 staff.

Not sure if I need to create any security group and add her to this group or a inbuilt group,

Edited September 14, 2017 by genesis