Hello, during the weekend, one of my users sent an email through OWA with a 6 meg jpeg attachment. All of a sudden he keeps on recieving non-stop NDRs (Hunderds of them) saying that the mail cannot be delivered because the recipient's mailbox is full. The recipient recieved multiple instances (hundreds) of the email until her mailbox went full. My SMTP queue shows that the connection to the recipient's mail server is still active (forever active). The only way for this to stop was to have the recipient block my domain on their exchange filter. But still, the connection on my smtp queue is still trying to send that email.
OS: Windows 2000 SP4
Email: Exchange 2K SP3
Question: What causes this problem?