Recently some iClouders have been having trouble with the service's email. The downtime made a bit of a mess for the roughly two million users it affected, but now Apple has apologised, and assured everyone that all the screwed up emails have made it through now.
This is just the email sent to one affected users, but it should speak to the state of the service on the whole. Hopefully Apple "working hard" to maintain the "best experience" doesn't include any more email weirdness. [9to5Mac]