Is there a way to block images from untrusted senders on the iPhone? I got a spam message on the iPhone and I accidentally opened it. It loaded an image and now I guess the spammer knows this is a valid address since they are sending more spam.

I'd like to prevent this problem in the future with my other email accounts. I know that I can disable Load Remote Images in the settings. The problem is that I believe this will not allow any images to load, even those from people in my address book.

Is there any way to get functionality similar to Gmail where it will only load the images from safe senders? Or is it an all or nothing deal?

Also, what's the significance of the word "Remote" in the setting name? Are there images that will load which aren't remote?
Doubtful without a custom email app of some kind.

Certainly the default iPhone mail app won't selectively (or conditionally on click) block images by default.

Have you tried the official GMail iPhone webapp?

http://gmailblog.blogspot.com/2008/01/new-gmail-for-iphone.html
http://www.google.com/mobile/mail/

Not a native app, but... there's surprisingly almost zero native iPhone apps that do Gmail.