On 5 Oct 2017, at 17:05, Alexandre Takacs wrote:
Hello
Sorry if I missed it, but I can't seem to find information on this
topic.
Is there any provision in MM to validate DKIM informations in received
mail (either built in or via some bundle) ?
None that I'm aware of. This is unsurprising, since DKIM validation
after final delivery and IMAP retrieval is potentially problematic. It
might work, but it might not for no reason of any piece of the delivery
and rtrieval chain being wrong.
Any pointer appreciated.
If I were to do this, I would FIRST check for an
"Authentication-Results" header added by my own trustworthy server, if
my own trustworthy server added such headers. Were that header to be
absent, I would install the 'opendkim' package (available in MacPorts
and probably Homebrew) and rig up something to pipe messages into the
opendkim-testmsg tool an check the result code.
The value of DKIM validation at any point is dubious, given that anyone
can DKIM-sign their messages for the cost of a domain and some DNS and
MTA config clues.
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