Re: greylisting and MAIL FROM signing

On Tue, 16 Aug 2005, David Woodhouse wrote:

> On Tue, 2005-08-16 at 15:23 -0400, Stuart D. Gathman wrote:
> > I have run into a sort of impedance mismatch between MAIL FROM signing and 
> > greylisting.  
> > 
> > 1. I send a message with signed MAIL FROM (old SES)
> > 2. recipient rejects with 450 - try again in 300 minutes
> > 3. sendmail tries again, but the timecode has changed, and so
> >    the recipients greylisting software thinks I'm a new sender.
> > 4. go back to step 2
> 
> Reduce the precision of your timecode.

I thought of that after posting.  It doesn't help.  Old SES also increments
a sequence number for each outgoing message.  There really needs to be
a way for sendmail cf to recognize when we are retrying a deferred 
message.  There probably is - sendmail cf isn't exactly the most
clear and explicit language in the world...

I might need to go back to SRS signing.

-- 
	      Stuart D. Gathman <[email protected]>
    Business Management Systems Inc.  Phone: 703 591-0911 Fax: 703 591-6154
"Confutatis maledictis, flamis acribus addictis" - background song for
a Microsoft sponsored "Where do you want to go from here?" commercial.