Re: Strict canonicalization considered harmful

From: Alessandro Vesely <>
Date: Wed, 10 Dec 2014 09:41:02 +0100

On Tue 09/Dec/2014 22:10:14 +0100 Murray S. Kucherawy wrote:
> On Tue, 9 Dec 2014, Alessandro Vesely wrote:
>> Would you try the following for me, please?
>> From: "Display phrase of 49, so total line length is 76" <>
> Done, and:
> Authentication System: DomainKeys Identified Mail (DKIM)
> Result: DKIM signature confirmed GOOD
> Description: Signature verified, message arrived intact
> Reporting host:
> More information:
> Sendmail milter:
>> I'd be baffled if testing with a long From: field succeeds to. But I have no
>> idea why a length of 76 would break anything.
> Something is improperly wrapping long header fields, perhaps?

Yes, but what does that? Are you sure you had simple c14n? It's enough to
check that the From: field came back with no added whitespace. For example,
I paste below the header returned from medusa. You can see the test passed,
because I have reverted to relaxed c14n, but the From: is munged, so it would
not have passed if c14n had been simple --the subject of this thread.


Received on Wed Dec 10 2014 - 08:41:14 PST

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