When I "insert HTML" in Thunderbird to create an HTML message, Thunderbird downloads the images and sends them as attachments (making a filesize of 300kb+). I want the email to pull in the images from my website when the user open their mail. Any ideas?
I don't know why you should 'insert HTML' into a message body. I think you should just write the message as an ordinary HTML page. I don't send messages with pictures, but I receive many of them, and I see that people use the common IMG tag to include the pictures. Of course, they use the full URL of the picture. Good luck.