I have a separate email address set up at my own domain just for paypal and the bank account. In that way, if I ever get one of the spammies I will know the address has been "shared" or compromised in some way. The address is never used for any outgoing email of any kind, nor is it ever used on a board, for a microstock acccount, etc. My brother suggested this as he got caught up in a paypal mess late last year.
I did an experiment when I had AOL a few years back. I opened up an emal address off my AOL account one nite. I just opened the address, never went onto to the internet using that account name, never emailed from that account name, never did ANYTHING under that account name, It was a very unique address, not a common name with numbers, like John2634 or something like that. It was more like w29z44yt5. Within a week, I was gettting all kinds of porn spam, Kind of tells me it was an inside AOL job. I dumped the whole AOL thing shortly after that.