I'm looking for a simple way for my bookkeeper to identify emails that have been sent, but not yet received by the intended recipient. She currently requests receipts, but has to manually match up receipts to sent emails and keep track of the emails that have not yet had receipts returned.
Can Outlook tell me which receipt-requested emails are still waiting for the receipts to be returned? I've found no filters or advanced search options that accomplish this.
Thanks in advance.