[MlMt] Bounce emails?
Bill Cole
mmlist-20120120 at billmail.scconsult.com
Mon Jun 11 16:02:01 UTC 2012
On 8 Jun 2012, at 20:49, Joachim Tingvold wrote:
> On 9 Jun 2012, at 2:37, Bill Cole wrote:
>> That sort of feature in a MUA is fundamentally misguided. As
>> described it is an exercise in intentional deception.
>
> Sure. Abusing completely legit features can be said about a lot of
> things (-:
>
> That doesn't mean we have to sweep it under a carpet, using "it can be
> abused" as the excuse for it.
I guess I wasn't clear...
What you describe is an intrinsically abusive feature. Such a "feature"
has been offered in Eudora, Pine, Mutt, Claris Emailer, and Mail.app but
that fact does not change the fact that it is an essentially wrong thing
to do. A MUA that injects a message into the transport system should
always do so with clear identification of itself.
A header-adding resend (e.g. RFC2822/5322) is significantly less
problematic, and that was defined in RFC2822 because of the real-world
experience with MUA's doing the simplistic re-injection of unmodified
messages into the transport system with new arbitrary envelope
recipients. In the modern world, there is also a practical problem
because some spam filtering systems have figured out ways to do sanity
checks on Received headers looking for forgeries, and will see the
discrepancies of a pristine re-injection.
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