3. Recipient's Disk Quota Exceeded
Delivery has failed to these recipients or distribution lists: firstname.lastname@example.org The recipient's mailbox is full and can't accept messages now. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message later, or contact the recipient directly. _____ Sent by Microsoft Exchange Server 2007
The error message may look different if the recipient is on a mail system other than Nexus. In either case there is nothing you, as the sender, can do until the person has read their accumulated mail and moved it from their mail box until they are below quota and can receive mail again.