[computer-go] repeat postings

[Don Dailey]

On Mon, 2007-08-27 at 21:35 +0200, Heikki Levanto wrote:
> Some mail
> servers are starting to use greylisting, which intentionally delays
> mails that have sender-recipient pairs they have not seen before -
> this
> fouls a lot of spamming programs (I do that at my place of work).

How does this foul spamming programs?   Does it prevent a spammer from
sending out a lot of email or just delay the receiving of it?

- Don