I have confirmed that the user has emptied the Deleted Items, and still sees the delivery receipt in the 'Large' items. User is running Outlook 2013, if that makes a difference. Therefore, this results in no storage savings, as the delivery receipt still counts against his quota. What we're noticing is that if, for example, the original sent e-mail has a 4 MB attachment, but is deleted, the delivery receipt will be sorted under the 'Large 1-5MB' category in Outlook when organized by size, and reports the same size as the original message. In Microsoft Outlook 2010/2013, select New E-mail to create a new message, on the Options tab, in the Tracking group, Request a Read Receipt is placed at the bottom of the right corner. As such, he uses a delivery receipt (instead of a read receipt) when he needs to confirm receipt of important messages, and deletes the original message, especially if it's got a large attachment. I have an IT director who is pretty diligent about keeping his mailbox beneath his 1GB quota. My organization keeps a pretty tight hold on their mailbox quotas in its Exchange 2013 CU8 environment. Hello, hope someone can provide me some insight.

Outlook read receipt 2013