PGP/MIME (Was: One alternative to SMTP for email: Confidant Mail)

Antony Prince antony at
Thu Mar 26 19:21:06 CET 2015

On 3/26/2015 1:57 PM, Ville Määttä wrote:
> On 26.03.15 01:38, Daniele Nicolodi wrote:
>> On 25/03/15 23:56, Ville Määttä wrote:
>>>> On 26.03.15 00:14, Ingo Klöcker wrote:
>>>>>> So it's not mailman that's not smart enough, but the mail clients
>>>>>> the other recipients are using. Mail clients showing a
>>>>>> "signature.asc" attachment probably do not understand PGP/MIME
>>>>>> (which isn't that unusual because only a handful mail clients
>>>>>> support PGP/MIME out-of-the-box without additional plugins).
>>>> It seems to me that emails sent and signed by Thunderbird +
>>>> Enigmail are displayed just fine by it. No signature.asc quirks.
>>>> But emails sent by others are displaying the attachment in addition
>>>> to the normal Enigmail added UI signature information. Ingo, Doug,
>>>> Samir and Bob; I see the attached file for each of you but not my
>>>> own PGP/MIME mails routed back to me from the list :).
>> The difference must be somewhere else: I use Thunderbird 31.5.0 and
>> Enigmail 1.8 (20150316-1815) and, while it recognizes the signatures,
>> I see the attachment "signature.asc" for all the PGP/MIME signed
>> emails I've checked.
> I sent a signed message to Daniele off list. Signature recognized fine
> and no attachment. So a bug, i.e. the extra attachment, in Enigmail's
> reading of mails that have gone through Mailman even though Mailman
> produced MIME should be valid?

FWIW, I use Thunderbird 31.5.0 and Enigmail 1.8.1 (2015-03-23) and the
signatures verify just fine, but it does show the signature.asc as an
attachment. Viewing my own PGP/MIME mails in the Sent folder does not
show any attachments, but the signature verifies.


Antony Prince

Key ID: 0x4F040744
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