How do I directly change the incoming mail server for icloud in Mail? It's grayed out.

The pxx number is added automatically in the setup process and is normal: it probably represents different servers for different geographical areas, so you shouldn't worry about its presence. The address is greyed out to stop people tampering with it.

You could try the setup process again. Go to System Preferences>iCloud and uncheck Mail, then check it again. If that doesn't work, try signing out altegether in iCloud and then sign back in again, checking Mail and any other data types. This will set Mail up again from scratch.

Roger,

I am having this issue with my wife's iCloud account. I have force quit Mail, rebooted, unchecked and rechecked Mail from the iCloud pane in System Preferences, signed out of iCloud all together and signed back in, installed all system updates, and had no luck. Any other advice on things I might try? It is working fine on her iPhone and online.

I'm afraid that AFAIK you've gone through the card. You could try Support, though I don't know how helpful they are likely to be.

To contact iCloud Support: if you currently happen to have AppleCare, either because you recently bought Apple hardware or have paid to extend the inititial period, you can contact them here:

http://www.apple.com/support/icloud/contact/

You will need the serial number of the covered hardware.

If you are not covered by AppleCare, then - in common with other free email services - there is no free support and you may be asked to pay a fee.

Well, I do pay for additional iCloud storage, so hopefully that will count for something.

In any case as it appears to be their fault you may well be able to persuade them not to charge you.

So far, it appears to be a hiccup in service. My iCloud experienced the same symptoms tonight. Then upon the start of the call, everything cleared up...before we could determine the cause... The weird thing is that it was only affecting the MBP regularly. It would affect my iPhone intermittently, but not often. That keeps me from pointing a finger at the server with confidence, but all other email accounts on the MBP have been working fine...

Apple support just came back and said that they have been having server issues for the last week or 2...