On 9/19/23 09:42, Bill Cole via mailop wrote:
Removing brackets on addresses without display names is one of the
things that Sendmail (in some common configurations...) does.
A similar form of damage I just noticed today was an
outsourced-to-Microsoft mail service breaking a forwarded message's DKIM
signature when it rewrote:
From: <addr...@example.com>
Reply-To: <addressre...@example.com>
to
From: <addr...@example.com>
Reply-To: <addressre...@example.com>
(in case it's too hard to spot, changing two spaces to one between the
":" and the "<")
This change breaks the original sender's c=simple/simple DKIM signature.
Put the missing spaces back and it verifies again. Figured it out
because I received similar messages both directly and forwarded through
MS and could compare the headers.
If anyone from Microsoft wants more details, contact me off-list.
- Bill
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