Investigating why a DKIM signature (relaxed/simple) occasionally breaks
on mail to one of our users but not for the rest, it turned out his mail
was being forwarded internally by a sendmail MTA running on a workstation,
while others were delivered directly (through Postfix).
The particular type of message that breaks is generated by a Eudora MUA,
which does not insert spaces after commas in a To: header field.
Forwarding (or delivering to a mailbox) through sendmail (tried 8.14.2,
8.14.2, 8.13.3) gratuitously inserts a space after commas in a list,
which is not tolerated even by a 'relaxed' canonicalization in DKIM.
This turns a:
To: <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>,<[EMAIL PROTECTED]>
into:
To: <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>,
<[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]>
invalidating a DKIM signature.
It would be nice to fix the intrusive reformatting of a mail header.
Regards
Mark
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