Outlook form help needed please

[alex_read]

I am writing an outlook form in Outlook 2000, and have the following message appear:
An Exceprion of type Microsoft Outlook "You do not have permission to send the message on behalf of the specified user" was not handled.

Basically, it's a form with fields asking users about their PC spec. I send the form to them, they fill out the fields & send it back. All of this works, except my send button:

Sub CmdSend_Click()
 With Item.GetInspector.CurrentItem
  .to = [email protected]
  .subject = "Laptop Information - open full screen."
  .send
 End With
End Sub

If anyone knows what is causing this, help would be very much appriciated. Thank you. I have tried this button after allowing full rights to both the senders and recipients mailboxes.