Re: [exim] Exim and SPF

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Autor: Marc Perkel
Datum:  
To: exim-users
Betreff: Re: [exim] Exim and SPF


Mark Nipper wrote:
> On 10 Dec 2009, Marc Perkel wrote:
>
>> I'm not going to do SRS. I think SPF is a flawed technology.
>>
>
>     Why would you ask about something, and then almost
> immediately turn around and call it a flawed technology?

>
>     If you have a controlled environment where you know all
> mail for a domain (or domains) is flowing through a select set of
> mail servers, then SPF is a great solution and can easily help
> reduce the amount of garbage.

>
>     If this scenario does not describe your mail environment,
> then don't publish SPF records (or publish extremely lax
> records).  However, I think this scenario probably describes a
> large number of mail providers.

>
>


Sometime flawed technologies still have uses. SPF breaks email
forwarding. But using that flaw I may be able to detect forwarding
sources through SPF failures. The idea being that if it's legitimate
email but SPF is wrong then the message was likely forwarded from a
legitimate source.