I originally posted this issue on moz.sup.tbird and somebody
suggested posting it here. The suggestion I got over there was
to try https://nic-nac-project.de/~kaosmos/p7mHandler-en.html
but that didn't change anything.

I'm using Tbird 2.0.0.17 (20080914)

When a friend uses an Apple to digitally sign a message, I can
validate his signature OK (so that means I have his cert
properly in Tbird, right?), but when he encrypts the message,
I get a "Thunderbird cannot decrypt this message" error.
He's not using PGP, he's doing it in SMIME.

I can encrypt and sign a message with my cert that he can read.

I'll append first the header of the encrypted message that
I can't read, and then I'll append the header of the signed
message that I can read (because it's not encrypted)
and the signature validates OK.

Any suggestions would be greatly appreciated. I'm kind of new
at this encryption stuff so feel free to treat me as an idiot.  :-)

------------------------------------------

Here's the header of the encrypted message body that I can't read:

>From - Tue Oct 21 13:36:49 2008
X-Account-Key: account4
X-UIDL: 514289371
X-Mozilla-Status: 0000
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:

Received: from SMTP32-FWD by kinzelman.com
  (SMTP32) id A087B00A70000AEC2; Tue, 21 Oct 2008 08:51:07 -0800
Received: from mx1.timesync.com [12.181.175.91] by antares.timesync.com
with ESMTP
  (SMTPD-8.22) id A87B018C; Tue, 21 Oct 2008 08:51:07 -0800
X-policyd-weight: passed - too many local DNS-errors in
dsn.rfc-ignorant.org lookups
Received: from star3.baremetal.com (star3.baremetal.com [64.69.88.78])
        by mx1.timesync.com (Postfix) with ESMTP id 99EAC67819
        for <[EMAIL PROTECTED]>; Tue, 21 Oct 2008 09:50:31 -0700 (PDT)
Received: from [192.168.15.3] (adsl-75-37-8-19.dsl.pltn13.sbcglobal.net
[75.37.8.19])
        by star3.baremetal.com (8.13.4/8.12.10) with ESMTP id m9LG6LEA006885
        for <[EMAIL PROTECTED]>; Tue, 21 Oct 2008 09:07:17 -0700
Mime-Version: 1.0 (Apple Message framework v753.1)
In-Reply-To: <[EMAIL PROTECTED]>
References: <[EMAIL PROTECTED]>
Content-Type: application/pkcs7-mime; name=smime.p7m;
smime-type=enveloped-data
Message-Id: <[EMAIL PROTECTED]>
Content-Disposition: attachment; filename=smime.p7m
Content-Transfer-Encoding: base64
From: Richard Haley <[EMAIL PROTECTED]>
Subject: Re: HTML question
Date: Tue, 21 Oct 2008 09:07:52 -0700
To: [EMAIL PROTECTED]
X-Mailer: Apple Mail (2.753.1)
X-RCPT-TO: <[EMAIL PROTECTED]>
Status: U
X-UIDL: 514289371
X-IMail-ThreadID: 087b00000854630f
X-Antivirus: AVG for E-mail 8.0.173 [270.7.5/1708]

MIAGCSqGSIb3DQEHA6CAMIACAQAxggMkMIIBjgIBADB2MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQK
[etc.]

-------------------------------------
And here's a message that's not encrypted but is signed and I can
validate his signature successfully:

>From - Tue Oct 21 13:37:06 2008
X-Account-Key: account4
X-UIDL: 514289377
X-Mozilla-Status: 0000
X-Mozilla-Status2: 00000000
X-Mozilla-Keys:

Received: from SMTP32-FWD by kinzelman.com
  (SMTP32) id A0C97008E0000AF92; Tue, 21 Oct 2008 09:08:39 -0800
Received: from mx1.timesync.com [12.181.175.91] by antares.timesync.com
with ESMTP
  (SMTPD-8.22) id AC97018C; Tue, 21 Oct 2008 09:08:39 -0800
X-policyd-weight: passed - too many local DNS-errors in
dsn.rfc-ignorant.org lookups
Received: from star3.baremetal.com (star3.baremetal.com [64.69.88.78])
        by mx1.timesync.com (Postfix) with ESMTP id C67C26781E
        for <[EMAIL PROTECTED]>; Tue, 21 Oct 2008 10:08:09 -0700 (PDT)
Received: from [192.168.15.3] (adsl-75-37-8-19.dsl.pltn13.sbcglobal.net
[75.37.8.19])
        by star3.baremetal.com (8.13.4/8.12.10) with ESMTP id m9LH7Sj8026021
        for <[EMAIL PROTECTED]>; Tue, 21 Oct 2008 10:07:29 -0700
Mime-Version: 1.0 (Apple Message framework v753.1)
In-Reply-To: <[EMAIL PROTECTED]>
References: <[EMAIL PROTECTED]>
Content-Type: multipart/signed; micalg=sha1;
boundary=Apple-Mail-1--658940438; protocol="application/pkcs7-signature"
Message-Id: <[EMAIL PROTECTED]>
From: Richard Haley <[EMAIL PROTECTED]>
Subject: Re: HTML question
Date: Tue, 21 Oct 2008 10:07:58 -0700
To: [EMAIL PROTECTED]
X-Mailer: Apple Mail (2.753.1)
X-RCPT-TO: <[EMAIL PROTECTED]>
Status: U
X-UIDL: 514289377
X-IMail-ThreadID: 0c9700000854715a
X-Antivirus: AVG for E-mail 8.0.173 [270.7.5/1708]


--Apple-Mail-1--658940438
Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
        charset=US-ASCII;
        delsp=yes;
        format=flowed
[I deleted the text of the message here.]

--Apple-Mail-1--658940438
Content-Transfer-Encoding: base64
Content-Type: application/pkcs7-signature;
        name=smime.p7s
Content-Disposition: attachment;
        filename=smime.p7s

MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIGIzCCAtww
[etc.]
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