Recently I received some blank mail from And some one also got it he said no worry, but I am wondering Will you use payment gateway with some bug in the system? Now blank mail with that bug. Tomorrow, all the fund gone and you have BLANK ACCOUNT with the same bug.
Perhaps it's not coming from them? Even if it did, then it's highly unlikely a bug will wipe their databases, they have engineers and administrators monitoring the services around the clock. If you are so paranoid about it, then withdraw your funds and go elsewhere.
I am positive there is no way you can lose money from your paypal account. If you were, there would be a trace of it occurring, most likely through hacking.