Re: [gentoo-user] Filtering spam for a business address

[Grant]

> > Does anyone use a spam-filtering solution they think is accurate
> > enough to use with a business email address?  I'm getting tons of spam
> > and I'd really like to try and filter it out, but I need to make sure
> > I don't miss any legitimate email.  I'm using postfix and
> > courier-imap.
> >
> > - Grant
>
>         Greylisting because it doesn't filter anything it merely delays email
> with a temp 450 error. Real emails retry after an interval and spam does
> not so it eliminates about 90-95%. Couple with reasonable Postfix checks
> like making sure the sender domain exists, etc and a mail client with
> internal filtering. With the above in place I see maybe 1-2 actual spams
> in my inbox a week and averaging about eight a day in my spam folder.
>
> Postgrey is in portage and it'll take you about almost two full minutes
> to get setup and working. I suggest making the the greylist time 30
> seconds and the whitelist time 32 days.
>
> kashani

That sounds really nice.  Would you say sending back a 450 error is
100% reliable?  Which config option makes postfix check to see if the
sender domain exists.  I can't find it in /etc/postfix/main.cf.

- Grant
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