Email is Case Sensitive on Gravatar.com

Hello,

On Gravatar.com it seems I cannot add an email starting with a capital letter.

Yet, on a website, I can leave a comment using an email starting with Capitals.

But, it seems, Gravatar.com doesn’t know that an email with capital letters is to be treated as the same as the one without capital letters (or at least, allow me to add one).

Thus, if I write a comment on a blog using an email address written capitals, I have no gravatar.

Any thoughts?

Thank you!