[SAC] [OSGeo] #2475: OSGeo mail server on DNS blocklist
OSGeo
trac_osgeo at osgeo.org
Wed Dec 9 13:00:05 PST 2020
#2475: OSGeo mail server on DNS blocklist
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Reporter: Jeff McKenna | Owner: jsanz
Type: task | Status: new
Priority: critical | Milestone: Unplanned
Component: Mails & Mailing Lists | Resolution:
Keywords: mailman |
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Comment (by gdt):
(The DMARC stuff really should be a new ticket, as its a separate issue.)
The way DKIM works is that senders apply a signature and receivers can
then say "was this email signed by the originating domain".
DMARC adds a policy "if it's From: this domain and DKIM validation
fails, reject it".
Mailman, when configured to add things like "[tiff]" to the subject
line, and things at the end, modifies the message in such a way that the
dkim signature no longer validates. (gnupg signatures are also
invalidated.)
So if you turn off subject tags, and turn off footers, then there is no
need to work around dmarc because the message when it arrives will pass
validation. Neither of these things is necessary because the
information about which list is in the List-Id header and unsubscribe
etc. is also in headers.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2475#comment:32>
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