On 16 Apr 2019, at 5:18, Graeme Fowler via Exim-users wrote:
> HOWEVER: I don’t think this is advisable, as you could break DKIM
> signing if the over-long header is included in the signature.
Because header folding is a permissible in-flight message modification
per RFC822 & its successors, the DKIM 'relaxed' header canonicalization
(which is almost universally used) protects signatures from breakage by
folding.
--
Bill Cole
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