Apple's been having all sorts of issues with iCloud this morning, as a growing number of Mail users received an error message from a postmaster@mac.com account. 

Most users can still receive email but are getting the error message anyway. For some the problem only occurs on specific accounts, while other users are seeing it in all their accounts, no matter what they send or receive. 

To deal with the problem, frustrated users have launched an Apple support thread that's only seemed to get longer with time. 9 to 5 Mac spotted a few users complaining on Twitter, but Apple has yet to acknowledge the problem on its service page. 

[via 9 to 5 Mac]