I received an unsolicited email today from a certain Jake Desnake (no idea whether this is a real or just a fake name). "He" was offering a teaching position in ESL for 2000 USD a month in "Lima, Peru, South America" but asked me to pay 700 USD up front for visa and other administrative procedure fees.
The email address this mail was sent from is jake.desnake@ymail.com, and it seems that "ymail.com" is an alternative email address of a free Yahoo email account.
When I questioned the genuineness of this "job offer" in a reply to that person, I received an email back with only one word: "motherfucker".
Please be warned and stay well clear of this person!