Question

I have a script that does gpg-encryption of text and mails it out.

I use MacGPG / Apple Mail, which decrypts it fine, but doesn’t display the text afterwards and instead displays attachments.

These are the mails i construct, what is wrong with it?

...
Date: Wed, 25 Apr 2012 16:01:04 +0200
From: <deleted>
To: <deleted>
Message-ID: <deleted>
Subject: asdf
Mime-Version: 1.0
Content-Type: multipart/encrypted;
 boundary=4b5784e4-fc05-45bb-9a72-e9070a11423c;
 charset=UTF-8;
 protocol="application/pgp-encrypted"
Content-Transfer-Encoding: 7bit


--4b5784e4-fc05-45bb-9a72-e9070a11423c
Date: Wed, 25 Apr 2012 16:01:04 +0200
Mime-Version: 1.0
Content-Type: application/pgp-encrypted;
 charset=UTF-8
Content-Transfer-Encoding: 7bit
Content-ID: <deleted>

Version: 1

--4b5784e4-fc05-45bb-9a72-e9070a11423c
Date: Wed, 25 Apr 2012 16:01:04 +0200
Mime-Version: 1.0
Content-Type: application/octet-stream;
 charset=UTF-8;
 name=msg.asc
Content-Transfer-Encoding: 7bit
Content-Disposition: inline;
 filename=msg.asc
Content-ID: <deleted>

-----BEGIN PGP MESSAGE-----
Version: GnuPG v2.0.17 (GNU/Linux)

<PGPDATA>
-----END PGP MESSAGE-----

--4b5784e4-fc05-45bb-9a72-e9070a11423c--

Answer 1

I think your problem here is, that the encrypted data contains only plain text and is not a fully compliant RFC822 mail message.

As the PGP/MIME RFC 3156 states under section 4, OpenPGP encrypted data

Before OpenPGP encryption, the data is written in MIME canonical
format (body and headers).

Following is an example of an RFC822 compliant mail message, which should
be processed and displayed as expected.

Content-Transfer-Encoding: 7bit
Content-Type: text/plain;
charset=us-ascii

This is only encrypted!