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Re: [ietf-smtp] Is this a valid Message-ID header ?

2020-03-05 22:40:20
On Fri, 6 Mar 2020, Mark Andrews wrote:
Conversion of all ASCII headers to utf-8 mime encoded should be banned. Apart
from testing encoding/decoding it serves no useful purpose and if you want
to perform such testing you can always add a non ASCII character.  MUA’s that
do this are deliberately breaking interoperability with old MUAs.

The spec is pretty clear where you can have MIME entities and where you can't. You can't have them in Message-ID's, References, or the actual address in To, From, Cc, etc.



On 6 Mar 2020, at 14:27, Valdis Klētnieks 
<valdis(_dot_)kletnieks(_at_)vt(_dot_)edu> wrote:

On 04 Mar 2020 23:34:13 -0500, "John Levine" said:
I read IETF mailing lists on the IETF's IMAP server* and of late I've been
seeing some awfully funky stuff.

This is an actual Message-ID header in one of the messages in dnsop.
Is that valid?  Even though the MIME decodes to a an ASCII message ID
in the <string@domain> format, I think the answer is no.  That's not
what RFC 5322 sec 3.6 allows.

I'll see your Message-ID, and raise you a... not even sure *what* to call it. :)

From my collection of emails that give exmh indigestion:

% grep UTF-8 183
To: =?UTF-8?B?bGludXgtdGlwLWNvbW1pdHNAdmdlci5rZXJuZWwub3Jn?
X-Mailer: =?UTF-8?B?dGlwLWdpdC1sb2ctZGFlbW9u?=
Robot-ID: =?UTF-8?B?PHRpcC1ib3QuZ2l0Lmtlcm5lbC5vcmc+?=
MIME-Version: =?UTF-8?B?MS4w?=
Content-Transfer-Encoding: =?UTF-8?B?OGJpdA==?=
Content-Type: =?UTF-8?B?dGV4dC9wbGFpbjsgY2hhcnNldD1VVEYtOA==?=
Content-Disposition: =?UTF-8?B?aW5saW5l?=

Amazingly enough, this managed to collect 10 Received: headers, land in my
mailbox, and exmh *mostly* figured it out:

From: tip-bot for David Brown <tipbot(_at_)zytor(_dot_)com>
To: linux-tip-commits(_at_)vger(_dot_)kernel(_dot_)
Subject: [tip:mm/readonly] ARM/vdso: Mark the vDSO code   read-only after init
Git-commit-id: 11bf9b865898961cee60a41c483c9f27ec76e12e
X-mailer: tip-git-log-daemon
Robot-id: <>
Robot-unsubscribe: Contact <mailto:hpa(_at_)kernel(_dot_)org> to get blacklis  
ted from these emails
Mime-version: 1.0
Content-transfer-encoding: 8bit
Content-type: text/plain; charset=UTF-8
Content-disposition: inline

But then finally gave up because it tried to use the undecoded content-type,
gave up, and tossed up a "save/print/don't decode MIME" dialog.

And yes, tip-bot got fixed quite quickly thereafter... :)
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John Levine, johnl(_at_)taugh(_dot_)com, Taughannock Networks, Trumansburg NY
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