http://support.apple.com/kb/HT5441

Summary

This article provides information on how existing iCloud Mail users can send and receive email using their new @icloud.com email address on their iOS devices and computers.

Products Affected

iCloud

If you are an existing iCloud Mail user with an @mac.com or @me.com email address, Apple has reserved an @icloud.com email address for you. You will receive an @icloud.com equivalent for every active @me.com or @mac.com email address or alias that you have as part of your account.

You can send email from your @icloud.com address by following these instructions:

  1. Begin composing a new email on the device of your choice.
  2. Select the From: field in your message.
  3. Choose your @icloud.com address from the list of addresses.
  4. Compose your message and send it.

To make your @icloud.com address the default address for sending email from your iCloud account, follow the steps below for each device you use to send email.

In iOS 6

  • Go to Settings > iCloud > Account (your Apple ID) >Advanced: Mail.
  • Under iCloud Account Information, tap your email address.
  • From the list of addresses available, tap the @icloud.com email address you would like to use as the default address for sending mail from iCloud Mail.

In OS X Mountain Lion or Lion v10.7.2 (or later)

  • Go to Mail Preferences > Composing.
  • Click the Send new messages from drop-down and select the @icloud.com email address you’d like to use.

At iCloud.com

  • Go to the Mail app.
  • Click the Action (gear icon) menu and choose Preferences.
  • Under Composing, click the Set a default address drop-down and select the @icloud.com address you’d like to use.

In Outlook

  • In Outlook 2007: Choose Tools > Account Settings > Email tab, select your @icloud.com email address from the list, and click Set as default.
  • In Outlook 2010: Choose File > Info > Account Settings > Email Tab, select your @icloud.com email address from the list, and click Set as default.


Note
: No matter which address you choose to send email from, you will continue to receive all email sent to your @me.com, @mac.com, or @icloud.com email addresses directly in your iCloud inbox.

Additional Information

Depending on when you created your iCloud account, your iCloud email addresses and aliases may end with @icloud.com, @me.com or @mac.com domains. Learn how iCloud email addresses are granted depending on when you originally created your account.