[TUHS] Who is running their own mail server and what do you run?
robert at timetraveller.org
Thu Sep 21 13:04:45 AEST 2017
On Wed, 20 Sep 2017, Grant Taylor wrote:
> On 09/20/2017 07:30 PM, Lawrence Stewart wrote:
>> We have 3 MX records with weights 10 50 100, but only the second one has an
>> SMTP server behind it. This tends to discourage spammers.
> Do the first and third MX actually resolve to an IP? Are they pingable?
> Are you sending TCP resets?
This is a well established technique known as Nolisting. I believe the
safest option is for the port to be unbound and thus for a TCP RST to be
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