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Re: best practices for fighting spam with Debian?

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On Mon, 19 Dec 2016 13:09:22 +0100
Vincent Lefevre <vincent@vinc17.net> wrote:

> On 2016-12-16 17:58:26 +0000, Joe wrote:
> > It is therefore an important matter that the email admin ensures
> > that the PTR record *always* resolves to a hostname which resolves
> > back, which can if necessary be achieved by creating a fictitious A
> > record for just this purpose. It is not necessary for this hostname
> > to match either HELO or domain MX, though it's worth doing if that
> > isn't difficult.  
> 
> But you need to hope that the nameserver is compliant and
> in particular, won't truncate the list of IP addresses as
> with: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=834098
> 
> > This check used to be pretty much a guarantee of a business IP
> > address, but unfortunately many home ISP accounts now have
> > complementary A-PTR records, making spam detection much harder.  
> 
> Their users may need to send mail after all.
> 

Which they can do through their email provider, or more likely, through
webmail, without any PTR record at all.

Running a SMTP server on the Net requires a small amount of knowledge
and carries a certain amount of responsibility, which cannot reasonably
be expected of home users.

-- 
Joe

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Thread

best practices for fighting spam with Debian? Daniel Pocock <daniel@pocock.pro> - 2016-12-15 09:20 +0100
  Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-15 10:50 +0100
    Re: best practices for fighting spam with Debian? Brian <ad44@cityscape.co.uk> - 2016-12-15 21:40 +0100
      Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-15 21:50 +0100
        Re: best practices for fighting spam with Debian? Daniel Pocock <daniel@pocock.pro> - 2016-12-16 08:00 +0100
          Re: best practices for fighting spam with Debian? <tomas@tuxteam.de> - 2016-12-16 10:00 +0100
            Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-16 10:20 +0100
              Re: best practices for fighting spam with Debian? <tomas@tuxteam.de> - 2016-12-16 11:00 +0100
                Re: best practices for fighting spam with Debian? Lisi Reisz <lisi.reisz@gmail.com> - 2016-12-16 22:00 +0100
                Re: best practices for fighting spam with Debian? Lisi Reisz <lisi.reisz@gmail.com> - 2016-12-16 22:30 +0100
                Re: best practices for fighting spam with Debian? <tomas@tuxteam.de> - 2016-12-16 22:50 +0100
                Re: best practices for fighting spam with Debian? Brian <ad44@cityscape.co.uk> - 2016-12-16 23:50 +0100
                Re: best practices for fighting spam with Debian? Lisi Reisz <lisi.reisz@gmail.com> - 2016-12-17 00:50 +0100
                Re: best practices for fighting spam with Debian? Joe <joe@jretrading.com> - 2016-12-16 22:30 +0100
                Re: best practices for fighting spam with Debian? Richard Owlett <rowlett@cloud85.net> - 2016-12-17 13:10 +0100
          Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-16 10:10 +0100
    Re: best practices for fighting spam with Debian? Vincent Lefevre <vincent@vinc17.net> - 2016-12-16 13:10 +0100
      Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-16 13:20 +0100
      Re: best practices for fighting spam with Debian? Joe <joe@jretrading.com> - 2016-12-16 19:00 +0100
        Re: best practices for fighting spam with Debian? Vincent Lefevre <vincent@vinc17.net> - 2016-12-19 13:10 +0100
          Re: best practices for fighting spam with Debian? Joe <joe@jretrading.com> - 2016-12-19 18:40 +0100
            Re: best practices for fighting spam with Debian? Vincent Lefevre <vincent@vinc17.net> - 2016-12-20 01:30 +0100
  Re: best practices for fighting spam with Debian? Glenn English <ghe2001@gmail.com> - 2016-12-15 20:30 +0100
    Re: best practices for fighting spam with Debian? Sven Hartge <sven@svenhartge.de> - 2016-12-15 22:00 +0100
  Re: best practices for fighting spam with Debian? terryc <terryc@woa.com.au> - 2016-12-16 03:40 +0100

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