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I'm gobsmacked that you would advocate an ISP dropping a customers email bounces but at the same time wouldn't advise a customer to do it themselves - or am I not reading you right ? Issuing a 4xx puts the responsibility back on the originator of the message to resend the message which may not happen for some time. Whereas the backup MX could have more friendly rules for it's customers on resending - and thus reducing the delay in getting the email to the person. I take your point about Spammers assuming they are the ones actually sending them mail directly to the MX's. My understanding however is that more and more spam gets sent via Bot's. Which uses a customers ISP's outbound smtp server. We're seeing more and more customers being hit this way. Reference your comments on secondary MX's -- since the advent of ADSL more and more customers are using us as backup MX's or Smart hosts. Principally because the RBL's are picking on the ADSL IP space more and more. Best regards Mick E: mick@xxxxxxxxxxxx > From: James Fidell <james@xxxxxxxxxxxx> > Organization: CloudNine Consultants Ltd., Pitsford Hill Farm, Pitsford Hill, > Wiveliscombe, Somerset TA4 2RR. Reg. No. 3317659 > Reply-To: <list@xxxxxxxxxxxxx> > Date: Thu, 25 Jun 2009 16:30:11 +0100 > To: <list@xxxxxxxxxxxxx> > Subject: Re: [LUG] email > > Mick Vaites wrote: > >> However as we're talking ISP backup MX or Smarthost - they cannot drop >> bounces on behalf of their customer as it might be needed genuinely. > > Of course they can. It's possible, and there are people who do it. As > I said in my previous email though, that doesn't mean it's easy. > > I'd bet, however, that if a customer with a primary MX who listed their > ISP's backup MX in their DNS just had the ISP give a 4xx error > immediately after the SMTP RCPT, just about no-one would notice a > difference with delivery of genuine email and there'd be less spam and > backscatter getting delivered. > > James > > -- > The Mailing List for the Devon & Cornwall LUG > http://mailman.dclug.org.uk/listinfo/list > FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html -- The Mailing List for the Devon & Cornwall LUG http://mailman.dclug.org.uk/listinfo/list FAQ: http://www.dcglug.org.uk/linux_adm/list-faq.html