You really put the word "common" in common sense.
He was only 26 --- and apparently was sharing his email account with an Arab just 2 years ago --- so he would likely have still been in college then --- but it wouldn't be difficult to make your foreigner connections in college --- with students coming over here to gain some technical expertise --- even if the Arabs he met didn't know much about email accounts, they might have been impressed with his willingness to help them, show them the ropes.