Gmail is ICS's email client of choice. On this page, you'll find some useful tips.
Sidebar
Split Pane
View Modes
Inbox Type
Forward email as attachment
You can set filters in your inbox to sort emails into various groups and categories and view them separately in the sidebar.
In the search box at the top, click Show search options .
Enter your search criteria. If you want to check that your search worked correctly, see what emails show up by clicking Search.
At the bottom of the search window, click Create filter.
Choose what you’d like the filter to do.
Click Create filter.
Most likely, there’s a clash between the saved login caches between your accounts.
You can clear the cache with the steps below.
https://support.google.com/accounts/answer/32050?hl=en&co=GENIE.Platform%3DDesktop
On your computer, open Chrome Chrome.
At the top right, click More More and then Clear browsing data.
Choose a time range, like Last hour or All time.
Select the types of information you want to remove.
Click Clear data.
Once you’ve done that, we’ve found that making a profile in Chrome of each of the different email logins, keeps things nice and separated.
https://support.google.com/chrome/answer/2364824?hl=en&co=GENIE.Platform%3DDesktop
Add a new profile
On your computer, open Chrome.
At the top right, click Profile Profile.
Click Add.
If you choose to Sync to your Google Account, your profile name will automatically be your Account name.
Choose a name, photo and color scheme.
If you choose to turn sync on in Chrome with a Google Account for the new profile, your bookmarks, history, passwords and other settings will sync automatically.