From: Scott Kitterman (no email)
Date: Mon Apr 02 2007 - 10:08:28 EDT
On Monday 02 April 2007 05:50, Frank Church wrote:
> Do the recent version of postfix 2.3.x onwards have built in support
> for dealing with SPF and SRS?
>
> Are they in the form of patches or already built in?
You will find Postifx patches for SPF online, but their use is not
recommended. Much better to use the policyd interface (as Ralf already
suggested).
On Monday 02 April 2007 05:57, Ralf Hildebrandt wrote:
>
> Yes, the policyd interface
On the SPF implementations page:
http://www.openspf.org/Implementations
You will find a number of SPF policy servers for Postfix listed under
Extensions and Patches for Mail Servers.
On Monday 02 April 2007 06:03, Robert Schetterer wrote:
> Hi Frank,
> there should be example perl code in the src code of postfix for spf,
> after all i have integrated it in my servers and it works nice.
There is an older version included with Postfix 2.3 (and even older versions
with 2.2 and 2.1), but for the upcoming Postfix 2.4 release the decision was
made to just refer to the source location. See:
http://www.postfix.org/SMTPD_POLICY_README.html
http://www.openspf.org/Software
Both of the policy servers listed there have been updated to use libraries
that support the final RFC 4408 SPF design.
> I think milters are on the web too.
With the exception of SID milter from Sendmail, Inc. all of the SPF related
milters I've looked at have an SRS component that uses Sendmail specific
calls to modify Mail From and so I don't think there is a good SPF specific
milter solution for Postifx at the moment.
> But detecting spam with spf goes nearly /dev/null
> cause spammers are the first ones who have spf entries.
> Spf is good in spamd , to have just one more value to detect spam.
> As spf code ist patented by m$ i would recommend using
> dkim.
This is not correct. MS has applied for (or gotten, I've lost track) a patent
related to their SenderID which is related to SPF, but SPF itself is AFAIK
free of any patent issues.
I am not aware of a working SRS implementation for Postfix (I think you would
have to implement it in a SMTP Filter).
Scott K
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