DKIM Deployment

[Jesse Thompson <>]

 wrote:
> Hello,
>
> I've just subscribed to this list. So, I've read this thread in the archives and I' 
> like to comment it (that's why I've done a "copy and paste" and using the web 
> interface to post - sorry if this breaks the thread).
>
> *****
>
> Hi!
>
> Technically it's possible to combine DKIM and greylisting. You are
> allowed to return a temporary error code after the DATA-part just as
> well as after RCPT To and the sender should treat a temporary error code
> the same no matter after which part of the exchange it is received.
>
> Some implementations return a permanent error code after the DATA-part
> if they receive spam or viruses today and the same behavior could be
> used for greylisting if one wanted to.
>
> *****
>
> Yes, there are some greylisting filters which works after DATA phase. But the 
> problem is that DATA status response accepts/rejects DATA for ALL recipients.
>
> There was a draft (or a discussion about), around beginning 2007 at ietf-smtp 
> to implement RSAD (RCPT status after DATA) as does LMTP. But I don't know the 
> status of the idea.

Ok, well there is still potential for DKIM to be used to auto-populate a 
whitelist, so that subsequent message attempts from an IP, or 
IP/env-from combination, are not subjected to greylisting.

Jesse

--
  Jesse Thompson
  Division of Information Technology, University of Wisconsin-Madison
  Email/IM:

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