Custom rules for spamassasin?

[Craig McLean]

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Andy Green wrote:
> Craig McLean wrote:
> 
>> Andy Pieters wrote:
>>
>>>> Hi List
>>>>
>>>> We are getting quite some spam from japan and spamassassin doesn't consider it 
>>>> as spam.
>>
>> [snip]
>> This probably belongs on spamassassin-users. See
>> http://wiki.apache.org/spamassassin/MailingLists for more info on
>> subscriptions and searchable archives.
>>
>> They are a very helpful bunch, and will probably be able to point you at
>> a SARE rule which does the trick if the stock rules aren't firing.
> 
> Perhaps in this case a better solution is that his MTA should be
> configured to reject any mail coming in with a HELO name that is not
> true (ie, your mailserver external hostname or IP).
[mini-snip]
You might well be right. On high-load systems a caveat, however, is that
if you do this with RDNS queries and it'll lead to a potential DoS.

I haven't tested whether my mailserver will allow me to HELO with the
mailservers hostname but a phony IP. I suspect this will be covered
(assuming sendmail) by confPRIVACY_FLAGS or local-host-names.

I'll have a play and see if I can get a reaction from my MTA.

C.
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