An even more common way of making it load without causing the email to look like it has an attachment is to embed the image as a data: URI in an <img> tag. Sinc

An even more common way of making it load without causing the email to look like it has an attachment is to embed the image as a data: URI in an <img> tag. Since it's not remote, it will be loaded, but since it's not an attachment, your email client won't show it in the attachments list.