Re: [gentoo-user] Greylisting idea

[Grant <emailgrant@gmail.com>]

> > Greylisting seems to be the most effective way of eliminating unwanted
> > email.  The problem is that it also has the potential to eliminate a
> > legitimate email.  Couldn't a feature be added to greylisting software
> > that dispatches an email to the sender of any email that is
> > temporarily rejected and doesn't retry within a certain amount of
> > time?  The email could say something like, "Your message of {date} was
> > rejected as possible spam.  Please call us at {phone_number}."
> >
> > - Grant
>
>         I'd just configure a retry time of something large if you're worried
> about it. IIRC the default is one day and you could raise it to two days
> on a slow system without worrying that the db is getting too large.

How exactly are legitimate messages lost through greylisting?  I've
come up with these:

1. legitimate messages that don't retry (someone mentioned Amazon newsletters)

2. legitimate messages that take longer than the maximum specified
retry period to retry (has anyone run into a mail server that takes
longer than a day to retry?)

3. legitimate messages that retry from a different server each time
they retry (someone mentioned that they have seen this)

- Grant
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