Tired of entering the E-Mail ID's of all your contacts .
Even though dropdown menu helps in selecting the contacts still its too boring to select all.
The easy way out is to just click on contacts (present in left side) in G-Mail
See this image(click on it to zoom).
Now select "All contacts" as shown above.
Then select "All " option as shown above.
In case you want to send mail to selective contacts ,just check the corresponding checkbox.
As soon as you do this , Email option will appear on right side of your screen. Click on it and all selected contacts will be added to the recipient list.
Go ,flood you friend's INBOX .