updated 02:36 pm EDT, Fri August 8, 2014
Repeated outages in space of a month
"Some" iCloud Mail users have been unable to receive messages since about noon Eastern time, according to Apple's system status page. Apple hasn't identified the percentage of users affected, a cause, or when issues might be resolved. The system tracker doesn't usually provide the latter two pieces of information.
Today marks at least the third time in a month that iCloud Mail has been subject to downtime, the most serious incident having come on July 24. No root cause for the prior incidents was ever disclosed.