[Dovecot] [ot] spam (was: Re: Big sites using Dovecot)
joshua at roughtrade.net
Wed Sep 27 06:07:15 EEST 2006
On Tue, Sep 26, 2006 at 12:29:08PM -0500, /dev/rob0 wrote:
> Furthermore, users rarely understand how mail works. They think that
> sender addresses really mean something. You got spam from some sender
> address, so you should blacklist that address? Well duh, it probably
> wasn't really that sender. Maybe you just blocked a real person, an
> innocent victim of spammers.
Here's why we have white/blacklists at ISPs at all.
Whitelisting at ISPs is usually provided for users who receive mail
from broken automated systems that trip over heuristic spam-detection
filters (i.e. spamassassin and co). Telco Fax/SMS gateways are a
typical culprit, and badly coded feedback forms at websites.
Blacklisting at ISPs is usually provided for people to block spew.
It is a mistake to provide it alongside anti-spam controls.
Both are cheap hack solutions, but it is never worth an ISP's time
coming up with a sound and correct solution (usually - fix an
external, customer 3rd party source) for what is commonly an isolated
case. So, these imperfect but generic tools suffice.
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