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Re: Possible SPAM mitigation trick
From: /dev/rob0 (rob0
gmx.co.uk)
Date: Mon Nov 21 2005 - 22:51:42 CST
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On Monday 2005-November-21 21:32, taso wrote:
> I stumbled across this by accident, I'm not sure if my observations
> are statistically significant - maybe someone else can give it a try
> and report.
>
> Change the DNS zone file to something like:
>
> MX 10 Z
> MX 20 A
>
> Where Z is functioning SMTP host, and A is not. The important thing
> is that the functioning host name sorts after the non-functioning
> one, but has a low MX priority.
Jorey has posted about a similar idea; search the list archives for
"poor man's greylisting". I think his scheme was to use the bogus MX
second. I would suggest trying this:
MX 10 A
MX 20 Z
MX 30 B
... where again, Z is the real MX, and A and B drop or reject SMTP. A
and B could resolve to the same IP address, if there is a shortage.
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