Automatic email from my own application

I’ve got my own application which sends, with the help of MAPI, automatic emails in given time intervals without displaying the dialog box (so that the users aren’t bothered with it). Until now the user had WIN XP and MS Outlook Express. But now he switched to WIN 7 and emClient. The result is that when the email is being automatically sent, the dialog box is displayed and requires confirmation which is an unwanted outcome. Is there anything how to fix this problem ? Could it be done by changing the parameters in MAPI or using a completely different interface, e.g. some ActiveX dll element etc. ?

Hello,
I am sorry for the late reply. If it is still actual - contact me using this email: wilson@emclient.com