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Re: SPF Record ...

From: Peter Eisentraut <peter_e(at)gmx(dot)net>
To: pgsql-www(at)postgresql(dot)org
Cc: "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>,pgsql-core(at)postgresql(dot)org
Subject: Re: SPF Record ...
Date: 2006-11-17 08:41:46
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-www
Am Freitag, 17. November 2006 07:05 schrieb Marc G. Fournier:
> I'm thinking of adding one to DNS, but after reading up on it, I'm a bit
> concerned how this might affect some

I urge you in the strongest possible terms not to do that.  As someone who is 
professionally involved in that issue, I can tell you that SPF is both 
useless and dangerous.  It doesn't stop any spam, but it breaks email 
protocols, annoys and restricts users for no gain.

> Since those having accounts shoudl be limited to these two
> lists, can anyone comment on a) is this a bad idea? and b) would they be
> affected because they don't use SMTP AUTH and c) why aren't you using SMTP
> AUTH? ...

The fallacy is that proponents of SPF believe that users are free to choose 
their SMTP server.  Contrast that with the widely spread and generally 
welcome (among ISPs and government) practice of blocking outgoing TCP port 25 
to address the spam-via-zombies problem (compared against SPF, this practice 
at least works), you are then left with a situation in which some users 
cannot send any email at all anymore because their ISP wants email to go this 
way and the domain administrator wants it to go that way.  Ultimately, both 
of these measures seriously restrict the redundancy feature of the internet 
(what if your mail server is broken?) and impact the privacy and 
self-determination of users (what if I don't want ISP 1 or ISP 2 to count my 

But again, SPF doesn't stop any junk mail, so it's useless anyway.

Peter Eisentraut

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