On 26 September 2007, Craig Skinner  wrote:

quoted text
> Liviu Daia wrote:

> >

> >     How does spamd distinguish between a legitimate retry and a

> > re-injection of the same message with the same Message-Id, sender

> > etc.?

>

> It doesn't.

>

> Just what you described would probably be within the default 25 mins

> grey period.

    Why should it?  The second copy is sent in a separate run, that's

the whole point.  The only thing the bot has to figure out is how long

to wait until the second run.  A smart one would send a second copy

after 10 minutes, and a third one after, say, 35 minutes.
> Another delivery attempt would be needed after this time to pass

quoted text
> spamd.

    Moral: randomize the greylisting time...
    Regards,
    Liviu Daia
--

Dr. Liviu Daia                                  http://www.imar.ro/~daia