Public bug reported:
man opendkim indicates an incorrect default value in this section:
-c canon
Selects the canonicalization method(s) to be used when signing messages.
When verifying, the message's DKIM-Signature: header specifies the canonical‐
ization method. The recognized values are relaxed and simple as defined by
the DKIM specification. The default is simple. The value may include two
different canonicalizations separated by a slash ("/") character, in which
case the first will be applied to the headers and the second to the body.
In fact, the default value when installing the opendkim package without
making any modifications as set in /etc/opendkim.conf is:
Canonicalization relaxed/simple
This may sound trivial, but the fact of having simple as default (if it
were really so) might have adverse effects on sending out to certain
*proprietary* email systems not being able to validate the DKIM
signature even though valid. Here is a short POC of this "issue" :
https://www.linkedin.com/posts/christophe-dary-85330561_opendkim-
microsoft-dkim-
activity-7425848791469166592-H3aT/?utm_source=share&utm_medium=member_desktop&rcm=ACoAAAP0ghQB4yPo99CelJH1lOI2K6WaFNM7JVE
.
So there is no real issue at hand with the default values being correct,
but the documentation is misleading. This probably comes from upstream
here:http://www.opendkim.org/opendkim.conf.5.html but I couldn't find
how to report a correction suggestion there.
apt policy opendkim
opendkim:
Installed: 2.11.0~beta2-9build4
Candidate: 2.11.0~beta2-9build4
Version table:
*** 2.11.0~beta2-9build4 500
500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
100 /var/lib/dpkg/status
** Affects: opendkim (Ubuntu)
Importance: Undecided
Status: New
** Tags: canonicalization manpage opendkim
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https://bugs.launchpad.net/bugs/2141240
Title:
Incorrect default value in man page of 'opendkim'
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