DKIM Deployment

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.

Regards

José-Marcio