On Wed, 23 Feb 2011 12:40:21 +0000, RW wrote:
On Wed, 23 Feb 2011 13:22:22 +0100
Per Jessen <p...@computer.org> wrote:
Henry | Security Division wrote:
> Hi Martin,
>
> i know what you mean. Your sender domain is gregorie.org. There
are
> two MX records in your DNS Zone. So that´s fine. I just want
> Spamassassin to flag mails from senders who have no MX Records. I
> have tested this anti-spam mechanism in a big environment on a
> commercial mailgateway and much spam is filtered just by this
rule.
> It caused some false positives in the beginning of course but I
> personally think that everybody who sends mails should also have
MX
> records to receive mails!
The "default" MX is the A-record for the domain.
There's a test
describe NO_DNS_FOR_FROM Envelope sender has no MX or A DNS records
score NO_DNS_FOR_FROM 0 0.379 0 0.001 # n=0 n=2
For me it hit more ham than spam. It's pretty common for newletters,
autogenerated replies etc to use a domain or subdomain with no MX
record.
Thank you! Is this a default ruleset which has to be uncommented?
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