Spam from same email ID.

[Dhaval Soni]

Dear All,

As per Alex, let me try smf-spf.

Thank you,

On Thu, Sep 9, 2010 at 8:40 PM, Steve Freegard <steve.freegard at fsl.com>wrote:

> On 09/09/10 10:24, Glenn Steen wrote:
>
>>
>>> You might have DKIM and SPF in SpamAssassin; but these are totally
>>> useless
>>> unless the domain you are having this problem with (e.g. 123l.com)
>>> actually
>>> publishes or uses them...
>>>
>>> smf at smf-laptop:~$ host -t TXT 123l.com
>>> 123l.com has no TXT record
>>>
>>> Same with smf-spf or milter-spiff; they'll only fix this problem if a
>>> policy
>>> is published for the domain in question (ideally a '-all' hard fail).
>>>
>>> Regards,
>>> Steve.
>>>
>> I'm a bit rusty on the rendmaul...Oops, sendmail ... side of things,
>> but couldn't one do pretty much the same as I do in PF? That is, use
>> an access-like map to disallow ones own (or customers) domain(s) as
>> (envelope) senders? The loss for any typical smaller business would be
>> greeting card stes etc, so shouldn't matter much.
>> Sure, SPF with correct DNS record(s) would perhaps be easier, but ...
>> sometimes it is easier to futz with ones MTA than with a (possibly
>> externally managed) DNS:-).
>>
>
> No reason why you couldn't add something like:
>
> from:mydomain.com         REJECT
>



>
> But there be dragons here if you use the box for anything other than
> inbound mail e.g. SMTP AUTH, smart host or if you have a secondary MX. I've
> never tried it - but I suspect that you can mitigate some of that using
> 'connect:ip.ip.ip.ip    OK'.
>
> Cheers,
> Steve.
>
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-- 
Kind regards,
Dhaval Soni
Red Hat Certified Architect
ID: 804 007 900 325 939

M: +91-9662029620
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