All,
On 09/15/2014 07:39 PM, Henrik Schack wrote:
In Denmark we have a somewhat large (10K+ domains) anti-virus/spam
provider breaking DKIM signatures.
They break DKIM signatures on incoming email by adding a "Virus
scanned by xxxx" line to the body of the email.
Not sure how to fix this, but perhaps some day they'll get tired of my
bi-monthly calls and emails complaining about how they do things.
it's nice to see how many respondents in this thread gave all sorts of
advise to Henrik how to deal with a problem, which basically cannot
solved by him because it is caused by some 3rd party (modifying the body
of a mail for adv. purposes).
I interpreted Henrik's mail as a followup to the thread that John Kelly
started, titled 'Indirect mail flows'. In my view both John and Henrik
tried to make (a start of) an inventory of all sorts of real-life
situations that potentially can break DKIM signatures or more in
general: cause DMARC failures for legitimate mail flows where sending
DMARC policy is p=reject.
And before starting the discussion about possible solutions it may be
better to first 'complete' [1] this inventory.
/rolf
[1] the inventory will never be 100% complete, of course.
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