Delivery has failed to these recipients or groups:
recruitment@hr.nestle.com
The email address you specified couldn't be found or is invalid. It may be due to a bad entry in your Outlook or Outlook Web App recipient AutoComplete cache. Use the steps below to delete the entry from the cache:
Click .In the field start typing the recipient's name or email address until the recipient appears in the drop-down list.Use the DOWN ARROW and UP ARROW keys to select the recipient, and then press the key.
Then resend your message – delete and retype the recipient’s name or e-mail address before sending it.
For more tips on how to resolve this issue see DSN code 5.1.1 in Exchange Online.