Lastminute.com flight ticket (Munich)

Hi all
I booked a flight via Lastminute.com and they send me an email with the electronic ticket number.
Does anyone know if that is enough in order to travel?
Do I have to go to airport with the electronic ticket number and my passport and they will give me my boarding pass?

Please help me cause the Lastminute.com is not answering!
Thank you all in advance!