JMail

Jeg er ved at forsøge at sende en e-mail med JMail til mig selv men jeg får fejlmeddelelsen:

jmail.Message (0x8000FFFF)
The message was undeliverable. All servers failed to receive the message
/ucsigncom/thankyou.asp, line 107

Min kode ser sådan her ud:

Set jmail = Server.CreateObject("JMail.Message")
  jmail.AddRecipient strEmail
  jmail.From = "cdygaard@worldonline.dk"
  jmail.Subject = "Under Construction Sign"
  jmail.HTMLBody = "Dear " & strFirstname & " " & strLastname
  If strCompanyName <> "" Then
  jmail.appendHTML " from " & strCompanyName & ".<BR>"
  Else
  jmail.appendHTML ".<BR>"
  End If
  jmail.appendHTML "Thank you for purchaseing my under construction sign.<BR>"
  jmail.appendHTML "I hope you will find it very usefull, and that you will come<BR>"
  jmail.appendHTML "back if you need it for another domain. You are now allowed<BR>"
  jmail.appendHTML "to use the under construction sign for the domain '" & strDomainName
  jmail.appendHTML "'.<BR><BR>Best regards<BR><BR>Christian Dygaard"
  jmail.AddAttachment("c:\inetpub\wwwroot\ucsigncom\i\ucsigns.zip")
  jmail.Send( "mailserver.worldonline.dk" )

Hvad er der galt?