I've been looking lately and a "large" number of double bounces to postermaster are caused by people who use "MailWashers" to Bounce Spam. I rmember the days when I could read every message to postmaster(a)isp.co.nz They are quite easy to spot as they all have the format of: mail.local: unknown name: username 550 username(a)domain.co.nz ... User unknown Coming from MAILER-DAEMON(a)domain.co.nz (usually the ISP's one) (and forging the email (which I presume is against all ISP's T&C) In mailwashers FAQ it says: ------- Do the spammers know I am bouncing email? No, spammers do not know you are bouncing messages. Bounced messages look just like a returned mail message you would receive if you sent an email to an incorrect address. --------- If I can tell if someone if using mailwasher.. why cannot the spammers? Even so I would think 99.9% of all emails bounced via this program don't get back to the spammers anyway (they don't use proper from addresses or use someone else's domain to send from (anyone in NZ using/looking at using SPF? to stop this type of thing) What I am trying to say (if not very well). What do people think of this feature of mailwasher. I've emailed the writer a few times for comments over the last few years and heard nothing from him. Have ISP's complained to uses using it? stopped people using it? or what? Thanks Craig Whitmore