I'm looking to use iCloud as my main email source, BUT use Gmail as my PRIMARY, as I always have. I always use Outlook and Yahoo for various reasons, which all get forwarded to my GMail account. I DO NOT plan on giving my iCloud address to anyone (friends, social networks, my job, etc.). But I do want to use it as my main email interface. I know I can forward Gmail to iCloud so that's the easy part. How do I setup iCloud Mail to be able to reply & compose with my Gmail address instead of iCloud address?