hey does anyone know if this is legitimate??

Hi ordered my fella pair of vans from America and just had email saying I need to pay 12 quid import duty, from company called customs clearance Ltd. dont mind paying it but just want to make sure its legit first as I thought I would get card from postman not an email if I had to pay import duty ?? cheers

Just an update contacted dhl and they confirmed it was legit and that i should pay it, Paid through paypal so fx if any trouble they can help. Tracked the item and it said it was waiting in customs and that they had contacted me for payment so all seems to add up.... Thanks again everyone