In my case I am selling 2 road bikes, and a guy messaged me to email him about more specifics (Which I did)
He said in his message that he was using his friends phone, After I emailed him I received emails from 2 other email addresses both saying similar but conflicting info. Long story short... He said he was gonna send a check with an extra amount some of which I should keep for holding the bikes for him and the remainder was to be sent to his "Delivery/pickup" company out of state. Basically cash the check take out the remainder and send it. (Of course this is gonna be a fraudulent check and I'm gonna get burned) So i'm gonna contact the authorities as soon as I receive this check. Beware of stuff on wallapop.