If you like, you can hand-pick the image that appears when your email campaign is posted to Facebook or Twitter (instead of letting those services pick an image at random). Here's how:
- Select the message you want to edit and find the image you want to use. The image must already be included in the message itself (i.e. you can't use a random image that's unrelated to your email campaign).
- While holding down the control key on your keyboard, click on the desired image and select "Use as Social Sharing Image".
After your email campaign is sent, your selected image will appear when someone posts your email campaign web URL to Facebook or Twitter.