Concert tickets received through email are just as valid as tickets purchased at a ticket stand. As long as you can ensure the tickets you received are authentic, you can use them just like paper tickets.
Authentic concert tickets that are purchased prior to the time of the concert always have a serial number and bar code. If tickets are missing those elements, then they should be requested immediately from the seller.
Fake email tickets that look authentic exist, but encountering them is uncommon. If you suspect that your tickets could be counterfeit, you may contact the customer service department of the ticket seller. The ticket seller may ask for your proof of purchase.