MapiSendMail gives 'not supported'

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: Hi, i have a problem in trying to send an email in delphi 2005. : I use Win XP, Outlook and an exchange server. : The problem is that i currenty use MapiSendMail(..), : and MapSendMail gives me constantly an errorcode 26 (not supported) : The parameters for MapiSendMail are correct. : I have used various ready examples, but to no avail. : I beginning to believe that Outlook or the Exchange server is the culprit. : If anybody has an explanation it would be great. : PS: Userinteraction in sending the mail is not needed, therefore i'am not : using mailto. : Thanks in advance for any advice. : Thanks, Ron