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.
> 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.
Wietse
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