The problem is that the images you are sending are referencing your local
drive. You have 2 options:
1) Copy the images to an image directory on the server and have the HTML
reference them there. That way, as long as they read the HTML when connecting
to the internet, the pics will resolve properly.
2) When you create your email, assuming you are using an email client that
can handle most HTML (Outlook does OK but not perfect), then you can create a
new email and make sure it is in HTML mode. You can check the FORMAT menu
option when you create a new email. Then preview the HTML you want to
include. Copy it from your browser and paste it into your email. You may have
to play with the formatting slightly. This way, the pictures will actually be
part of your email and will resolve properly.