OTTAWA - Research In Motion Ltd. and the BlackBerry are putting their mark on snail mail.

Canada Post is releasing a new commemorative stamp honouring the Canadian invented smartphones.

The Crown corporation says the device "freed information workers from their desks and changed the way the world communicates."

The stamp is one of four being released to recognize Canadian inventions.

The three others recognize the electric oven, the electric wheelchair and the cardiac pacemaker.