On 25/Apr/10 08:04, [email protected] wrote:
>>> field, DKIM is doing something "wrong".  In any case, it was suggested on 
>>> that list that "relaxed" header canonicalization be adjusted to accommodate 
>>> this.

I'd rather define new canonicalization algorithms than tamper with 
existing ones.

>> [...] but the addresses in To:, From:, Cc;, and so forth certainly are

> [...] But since new media types are defined all the time, and old ones are 
> revised, to say nothing of the types people just make up and never register. 
> As such, you cannot possibly code something that gets case normalization 
> right in general. So yes, it's hopeless.

An alternative would be to err on the other side: a "mellowed" 
canonicalization, that respects only the fields and entities whose 
meaning and encoding is well known and stable, so as to allow some 
kind of forgeries rather than accidental breaking.
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