Sending email from outlook IMAP to GMAIL where embedded images are added as attachement

Hey 

This is the mail i want to send to my customers making use of Outlook.
The majority of my customers make use of GMAIL. So, i decided to test the mail before sending it out.

But once i have sent the email to a GMAIL account.
The images are not embedded in the mail, but are sent as attachments.

So, this is the result i get.

Does anybody know how i can change this?
It's not the GMAIL settings, as this is just a standard account, where i haven't made any change to the GMAIL settings.

Thanks in advance!