On Mar 11, 2007, at 1:46 PM, Kris Kennaway wrote:

On Sun, Mar 11, 2007 at 01:43:22PM -0600, Chad Leigh -- Shire.Net LLC wrote:

On Mar 11, 2007, at 1:36 PM, Kris Kennaway wrote:

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
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.

No, it forces you to set up a correct RFC abiding system

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
want to).

If your system is following the RFCs then you should have no
problems.  YOU should fix your broken system.  Sending emails without
a valid from address is disconsiderate.  Why should I accept a mail
from an account that violates the RFCs about accepting DSN back?

Perhaps we are talking about different things, I am talking about
systems which send me an email back requiring me to do steps a, b or c
in order to complete delivery of the email.

No, we are talking about the MTA verifying that the sender address is a real address that can accept either mail back or at least a properly formatted DSN back.

The things you talk about ARE a PITA and I usually ignore them unless the person is wanting to give me money... (Ie a customer who placed an order with another business I run for example).


Chad Leigh -- Shire.Net LLC
Your Web App and Email hosting provider
chad at shire.net

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