Email address does not exist - but it does ... ?

Email address does not exist - but it does ... ?

Hi, 

I have a Zoho CRM free account with Super Admin marco@malariamuseum.com ( I can see that when I log in as another user).

When I try "forgotten password" it says:

Sorry, no account present with the mentioned email address.You can  Sign Up  for a new account.

Can you help?

Marco