Erik Espinoza wrote:
> Hey Guys,
>
> I ran into a problem while testing a greylisting patch from Bill
> Shupp's site. Many of the new antispam appliances and certain
> firewalals are used as a smart host, so it looks as follows:
>
> Exchange -> antispam appliance -> QmailToaster
>
> Many of the antispam appliances are having issues with temporary 4xx
> errors, they will not retry later as per the standard. I've run into
> this a few times, and it's always tough to diagnose. Just thought I'd
> put out a notice that if you use greylisting, you may lose valid mail
> because of this.
>
> Buyer Beware....
I personally don't use Greylisting except on backup MX hosts, which get
more abuse. Besides, greylisting is not a long term strategy IMO. If
it gets popular, bulk mailers will just start retrying and it'll become
useless.
However, I don't see the advantage of putting greylisting behind an anti
spam appliance. I am surprised that they don't retry after a 4xx error,
though. That's bad.
Regards,
Bill
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