The Droid 2 has a kind of universal email inbox that lets you check all your email accounts in one fell swoop—no need to check your home, work, and other email separately. To get to it, from the Application Tray, tap Messaging. You see, at a glance, all your email and social networking accounts, as well as your text messaging records. Next to each account icon, you see the number of unread messages or conversations.
If you want to see messages from any individual account, tap that account’s icon. But the Universal Inbox icon is a better bet. Tap the icon, and you see all the email from all your email accounts in one place. You can then read your mail, and reply to those you want, without having to think which account they came from. The Universal Inbox is smart enough to know that if you received mail to your personal email account and respond to the email, it should send from that account.
Note
You won’t see incoming mail sent to your Gmail account in your Universal Inbox. You’ll have to check that separately.
If you want to know from which account you’ve received a particular email, when you’re reading the email, tap the small right-facing arrow 
at the top-right of the screen. You see the name of the account to which the email was sent, and more header information. To see less information, tap the arrow, which has now turned into a down arrow 
.
