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DATE 2017-09-01

HANGOUT

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Key: id Value: 546953

Key: archive Value: 2017-09-01

MESSAGE
DATE 2017-09-23
FROM ruben safir
SUBJECT Subject: [Hangout - NYLXS] DKIM set ups
From hangout-bounces-at-nylxs.com Sat Sep 23 19:50:46 2017
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Subject: [Hangout - NYLXS] DKIM set ups
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I'm reading this text on setting up dkim

http://www.zytrax.com/books/dns/ch9/dkim.html#examples

and this paragraph has me confused and puzzled

To illustrate this process, assume that mail with an address of
user-at-example.com when originated from the office is sent from, and
signed by, the example.com MTA which maintains a single private/public
key pair for this purpose. The example.com domain publishes the public
key in its DNS in a DKIM TXT RR under the name
onlyone._domainkey.example.com. The DKIM-Signature mail header from mail
originating from the example.com MTA will therefore contain (among
others) an s=onlyone (selector) field and a d=example.com (domain-name)
field from which the receiving or validating mail server can construct
the DKIM TXT RR name as defined above and authenticate the email.

Now assume further that user-at-example.com will also send mail from home
via an ISP's MTA whose domain name is example.net and which publishes
its DKIM public key under the name publicmail._domainkey.example.net. In
this case the DKIM-Signature mail header covering mail sent from the
mail address, say, user-at-example.com (and perhaps all other mail
originating from this MTA) will contain an s=publicmail (selector) field
and a d=example.net (domain-name) field from which, again, the receiving
or validating mail server can construct the DKIM TXT RR name as defined
above and authenticate the email. By default the signer will sign mail
for the domain and all its subdomains - meaning that a single DKIM TXT
RR can be created to cover the entire domain. Mail sent from
user-at-example.com and user-at-sub.example.com can use the same selector and
hence use the same key.


~~

If I understand correctly, someone sending email from an eternal MTA
with a foreign email address ends up with a signature from the foreign
MTA. What use is that? It is still an open relay.
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  1. 2017-09-01 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] Fwd: FW: DCAS IT Career Event
  2. 2017-09-02 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] New Arch without systemd and ending manjaro openrc
  3. 2017-09-02 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] New Arch without systemd and ending manjaro
  4. 2017-09-03 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] AI positions at Esty
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  7. 2017-09-04 From: "S." <sman356-at-yahoo.com> Re: [Hangout - NYLXS] Free land and house | | I suppose you are
  8. 2017-09-04 Ruben Safir <ruben.safir-at-my.liu.edu> Subject: [Hangout - NYLXS] Walter Becker died ...
  9. 2017-09-04 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Walter Becker died ...
  10. 2017-09-04 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Walter Becker died ...
  11. 2017-09-04 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Walter Becker died ...
  12. 2017-09-05 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] 9-5 workdays mythos
  13. 2017-09-05 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] Kickbacks in the education field
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  18. 2017-09-06 From: "IEEE Communications Society" <noreply-at-comsoc.org> Subject: [Hangout - NYLXS] Live Webinar: Addressing Direction Finding in
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  23. 2017-09-07 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Numa node 0 is missing from
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  32. 2017-09-11 Ruben Safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half tonight
  33. 2017-09-11 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
  34. 2017-09-11 Ruben Safir <ruben.safir-at-my.liu.edu> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
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  36. 2017-09-11 Paul Robert Marino <prmarino1-at-gmail.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
  37. 2017-09-12 Ruben Safir <mrbrklyn-at-panix.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
  38. 2017-09-12 Paul Robert Marino <prmarino1-at-gmail.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
  39. 2017-09-12 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
  40. 2017-09-12 Ruben Safir <ruben-at-mrbrklyn.com> Re: [Hangout - NYLXS] Suck on the B Trainf or an hour and a half
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  64. 2017-09-23 ruben safir <ruben-at-mrbrklyn.com> Subject: [Hangout - NYLXS] DKIM set ups
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