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If it's an internal MX then there is no reason why this box shouldn't have knowledge of whether an email will eventually be delivered or not. 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. The only place that messages can be blackholed is by the person who's domain is being attacked. I my opinion (more flaming anticipated) if you have a domain that is regularly being attacked with a dictionary attack it is good net manners to blackhole instead of bouncing invalid email addresses. To that end a couple of domains that I've had for years are configured this way. In this way my misfortune is not passed onto someone else. Best regards Mick E: mick@xxxxxxxxxxxx > From: Martijn Grooten <sweetwatergeek@xxxxxxxxxxxxxx> > Reply-To: <list@xxxxxxxxxxxxx> > Date: Thu, 25 Jun 2009 13:44:16 +0100 > To: <list@xxxxxxxxxxxxx> > Subject: Re: [LUG] email > > On Thu, Jun 25, 2009 at 1:26 PM, Mick Vaites wrote: >> Most individuals with their own mailservers (on dsl lines most likely) don't >> run MX's they use smart hosts or backup MX's with their ISP. Eitherway >> neither the smarthost nor the backup MX has any knowledge of whether an >> email address at the domain exists. > > I would say that in this case it's the MX at the provider which should > know (i.e. be configured to know) it shouldn't send bounces to the > 'senders', except, say, if the sending IP address was included in the > SPF record of the domain the email claimed to be from. If your MX > receives email directly from the internet then I totally agree with > Simon that you should bounce undeliverable email as early as possible. > (Although, perhaps, it would be even better to wait some seconds > before sending the reply, thus annoying spammers a little bit more.) > > I have missed email sent to my work address -- which contains my name > and is thus easily misspelled -- where the sender, whose email wasn't > bounced, had no reason to assume it never arrived into my inbox. > > Martijn. > > -- > 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