A couple of times I got those and was suspicious and didn't call back. Then later found out they were legitimate!

Call him back and ask how he heard about you. Ask some questions. You should figure out pretty quick if it is BS. The only question they might not answer initially is the name of the company they are recruiting for. But they should be able to answer any other question.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra