Is Walgreens Pharmacy format a safe new item for its customers?

Today, I received an email from Walgreens, stating that I have three presciptions that are available for a refill. I did not ask for this service and wonder why its even necessary? I think each one of us knows when its time to refill a prescription and emailing the drugs name over the internet, could be attacked by hackers. Specifically, I am concerned about pain medicene that might be hijacked or stolen off the internet. Question: is this or should this be of grave concern for Walgreen customers?