Gmail

I use Gmail to email students about missing work when they have been gone.  I also cc the parents if I have their email address.  
When I need them to take a quiz online, I will email them the URL to click on.  

Thanks for sharing how to use Gmail to communicate with students! Sending quiz URLs via email is also very convenient, helping students access learning geometry dash scratch materials faster. I also use Gmail similarly and find it very suitable for urgent matters.