I recently became the "innocent bystander" mentioned in your reply to Peter Beaven last week: my private inbox filled up with tens of thousands of bounced, undelivered, and "out of office" emails. Is there anything that can be done, short of waiting it out or switching to another mailbox? Rob Harries
You can handle small volumes of bounces by using Mailwasher or Spam X to delete the spam emails on the server. If you have a "catch all" mailbox, it may also help if your service provider changes it to one that only accepts email to a specific address. If you're getting more than a few hundred bounces a day, try pleading with your ISP to do the filtering, but otherwise, there's not much you can do.
In the long run, everyone adopting SPF (Sender Policy Framework) should help, but at the moment you need your own domain name and too much expertise.