Outlook 2007 Send-Items Question

Hello Community,

got the Following Facts:

I defined the IMAP Folder "Send Items" in my Outlook System for saving send Mails within it. So far so good, works fine when i do "New" -> "Mail" "Write my Mail, making attach, send my Mail".
When i do this, my mails are stored in the Folder "send items".

When i do the Following:
Right click on a File i want to send by Mail -> "send to" -> Write my Mail and send my Mail" my mail is stored in the "Send Items" Folder of my local PST File.

Is there any Way to store send items in my IMAP Folder not in my Personal PST file when using the "send to" function?

Thanks in advance!