hvor meget må en meddelelse fylde?

Jeg forstår ikke denne her email som jeg hele tiden får fra ekspertens admin:
Lyder sådan her:

A message was sent to you that was returned to the sender(bounced) because it would have caused your mailbox quota to be exceeded.

The following is the reason that the message was over quota:

      Quota Type: Max Number of Messages
  Quota Available: 0
      Total Quota: 1000

The following is the information on the message that was bounced:

      Sender: "Eksperten mailrobot" <mailrobot@exp.dk>
    Subject: Netværk : Routers/Switches : trådløst net med topcom WBR 654 : 60
        Size: 5499
  Message ID: <7ba754ccbd54d9b9d4f20a09f89f4a82.q553615@eksperten.dk>
        Date: Sat, 23 Oct 2004 14:47:07 +0200
    Reply-To: [No Reply-To]

To fix this problem, delete some messages from your mailbox, and contact the sender to resend the message.

If the size of the message is too big, contact the sender to reduce the size of the message and resend the message.