I just noticed something strange. Whenever someone sends me a paypal payment, I always get an automatic email about it. The email says something like etc etc, I'm sure you have gotten emails like that before. But the strange thing is, this email is not send from Paypal, it is sent using the email of the sender, in this case, Billy Bob's email. In fact, if I hit the Reply button on my yahoo email, it will reply to Billy Bob's email. No where is there even a mention of paypal's email. Logically, the only way for this to happen is if Paypal logs into Billy Bob's email account, and then sends me an email. Am I just blind or is there something going on here
there will be some paypal.com header part when you click show full headers in that email with yahoo mail.