Bros if i were you, i would have googled Unicef site and narrow my search to Nigeria to see what kind of email/domain name they use for their correspondences/emails, but the [email protected] look too fake to be true. More so, Unicef is being sponsored by United Nations and i believe they will not ask 4 money from you before giving you job.
Though the ball is in your court you decide how to play it, but always pay it safe.
One love!!!!!!!!!!!!