My fiancé got iCloud set up today but whenever I send from my iCloud account on my iPhone or iPad to her iCloud account I get an error stating "The recipient email@example.com was rejected by the server because the user is unknown." She is able to send email to me from this account and sending her mail from my gmail account is working. Sending from the iCloud web interface works fine as well. Any ideas what could be causing this issue? Both running iOS 5.