Re: [exim] Message rejected due to long Reference: header

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Autor: Bill Cole
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A: Graeme Fowler via Exim-users
Assumpte: Re: [exim] Message rejected due to long Reference: header
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.

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Bill Cole
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