If you need to type a certain string on regular basis, you may want to set it up as a keyboard shortcut. But one cannot just associate a hot key with the string. Here is how to do it on Ubuntu without installing any extra package.
Go to settings > keyboard shortcuts. Scroll all the way down and click on the + sign to add a new shortcut. In the command field, enter the command
xdotool getactivewindow sleep 0.5 type “[email protected]”
Associate it with a shortcut, for example ctrl-k. Click the cross icon and you’re all set!
xdotool allows one to type some string or move the mouse pointer. Do a man xdotool to learn more.