[Elfan]

That is an interesting situation where a group of users might opt in and HTML could be a useful thing.

Are you sending photos via email? Aren't browsers generally a more pleasant way to view photos than mail clients?

[brlewis]

Having the thumbnails show in the email itself means people don't have to break their stride to know whether the photos are ones they're interested in. I keep in touch with a lot of family and old friends using the same email. Different people care about different photos.