Wietse Venema via Postfix-users wrote in
 <4vtb9v00wbzj...@spike.porcupine.org>:
 |Steffen Nurpmeso via Postfix-users:
 |> But one thing is plain, if lines get folded "artificially" to
 |> satisfy line length limits, then this is a whitespace that DKIM
 |> will see, and if it was not in the original message, the signature
 |> will break.
 |
 |After the DKIM signature is generated, the artificial line break
 |already invalidates the signature. The purpose of the artificial
 |space after this line break is to preserve the MIME structure, so
 |that humans aren't exposed to raw html, q-p, or base64 etc.

Maybe we are running off-bounds.

 |> The only possibility to get over this hurdle is to apply RFC 2047
 |> (or RFC 2231, in a parameter) MIME encoding, and then [...]
 |
 |Any such actions need to be taken sender-side, before the DKIM
 |signature is generated.

I agree.  That much is plain.

 --End of <4vtb9v00wbzj...@spike.porcupine.org>

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
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