[BALUG-Talk] Recommendations for email resender/"forwarder"? (infrastructure: Debian oldstable amd64, MTA exim4)

[Glen Martin]

MLMs can achieve this, imperfectly, and are overkill. But they're not 
magic, they just screw with the headers so downstream can't detect the 
envelope or body changes.

Have you tried to use the pipe syntax of aliases, eg
     don@linuxmafia.org: | /usr/sbin/DKIMstripper-sendmail.sh
            donmarti@whereever.com
            // I just made this up, don't shoot me
to forward via a munging script that:
- removes any header containing DKIM (including some non-standard 
workalikes such as X-Google-DKIM-Signature)
- possibly remove other provenance headers (eg I'm suspicious of 
X-Gm-Message-State) that could allow a downstream who is also upstream 
to wonder where their headers went
- forwards whats left on to sendmail

HTH

glen

On 8/12/2017 9:03 AM, Rick Moen wrote:
> Quoting Michael Paoli (Michael.Paoli@cal.berkeley.edu):
>
>> " ... but that may possibly cause other breakage ... e.g. DKIM, etc.?
> To my knowledge, the only means for redirecting mail intersystem that
> has a prayer of not triggering the more aggressive antiforgery
> tecchnologies (DKIM, DMARC) is MLMs.
>
>
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