how to display image in HTML email

A.M. wrote:All modern mail clients will block external images, which are often used by spammers. Usually, there's a notification displayed to that effect.

Thanks for your reply!

As you said there should be a notification to be displayed, such as Display images below. However, I dont get any notifications if i send email in this way.

Besides, the image in the email content will be changed to "cid:XXXXXXX" when i right-click the properties of the "no shown" picture.

So, I think there are some problems or somethings that i miss to set.