From: Victor Duchovni (Victor.DuchovniMorganStanley.com)
Date: Wed Sep 19 2007 - 14:44:24 CDT

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On Wed, Sep 19, 2007 at 03:08:33PM -0400, Wietse Venema wrote:

> > Is there anyone who feels they will benefit in practice (rather than in
> > theory) from a feature that allows 7bit mail mislabeled as 8bit to go
> > through unconverted?
>
> How would you solve the multi-hop problem?

Presumably, this about mail is *actually* 8bit.

    - If this my outbound gateway, and I am doing signing, I will
    down-convert first.

    - On inbound gateways I will verify first, add authentication
    result headers that internal systems will trust and make signature
    downstream moot.

    - If I am an outsourced MX provider, I downgrade as necessary (but
    only as necessary if we add the 8bit detection feature) and if
    the downstream customer can't verify signatures, they know what to
    upgrade, or can trust my authentication result headers.

    - If I am outsourced outbound relay (ISP, ...) I offer 8bit support,
    downgrade when necessary (possibly only when necessary), and people
    who sign 8bit without pre-converting get unpredictable results.

    - I am a list-manager or other re-submission service, I verify the
    original signature, record the result in a header I sign, then add
    my own signature. I am generating new mail, so it ought to be signed,
    by the list. The original signature may survive intact, but this is
    not essential.

Did I miss any important use cases?

--
        Viktor.

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