It seems that I've been stumbling around in the dark for years... What does "attach" mean when I insert an image? When I send myself an e-mail with an image, I don't see any attached file indicated. The image is embedded. When I send myself a test with an inserted image, and either click "attach this image" or not, I receive the same e-mail and very very many lines of code (binary?) at the end of the e-mail. When I check "attach this image" then the message's source has a full web page beginning with HTML and HEAD tags . Then after the closing HTML tag, I get all that code for the image. But when I want to insert an image and I '''UN'''check "attach this image" I no longer see HTML in the source. The e-mail is formatted but the source looks like plain text, and that is followed by all that code for the image. But there is no full web page setup beginning and ending with HTML tags. I thought when I formatted text, it was automatically an HTML e-mail. Clearly, I've never entirely grasped what is going on with HTML mail or with images in e-mails. Can anyone shed some light on what I'm looking at here? And why would I want to "attach" an image or not? (I'd rather the e-mail display the image rather offering an attached file to open.) Pros and cons? I'm preparing a small communications campaign so reducing the number of wild cards is more than academic. I will be truly grateful for any input, Jeanne Thunderbird 78.13.0 (Windows)