Tips for Gmail
 -Handy Gmail Features

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Preview Pane
'Always show the email list at the screen, even when you are reading the email content.'
Step-by-step Instructions

1. Click the settings icon

2. Choose ‘Right of inbox’
3. Then the reading pane will become the preview pane

Demo Video (Preview Pane)
Other Tips You May be Interested:
Show total unread messages in tab header
View the total unread count without clicking the Gmail tab.
Gmail Signature
Add a custom signature, with image presumably, to every email you send.
Automated Email Processing
For those emails from somebody, you may want to star them automatically.