Tool for validating sender address as spam-fighting technique?
kris at obsecurity.org
Sun Mar 11 19:36:10 UTC 2007
On Sun, Mar 11, 2007 at 12:41:48PM -0600, Chad Leigh -- Shire.Net LLC wrote:
> On Mar 11, 2007, at 6:31 AM, Justin Mason wrote:
> >for what it's worth, I would suggest *not* adopting this
> >as an anti-spam technique.
> >Sender-address verification is _bad_ as an anti-spam technique, in my
> >opinion. Basically, there's one obvious response for spammers
> >looking to
> >evade it -- use "real" sender addresses. Where's an easy place to find
> >real addresses? On the list of target addresses they're spamming!
> This is a red-herring. They already do that. They have been doing
> that for a long time. And it has nothing to do with sender
> Sender verification works and works well.
I hate sender verification because it forces me (the sender) to jump
through hoops just for the privilege of sending email to you. I send
a lot of "courtesy" emails to e.g. port maintainers who have problems
with their ports, and when I encounter someone with such a system I
usually don't bother following up (their port just gets marked broken
in the usual way, and they can follow up on it on their own if they
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