I experimented with this as I added to enigma_engine.php self-encryption, if no valid key was found for the receiver.

So, I appended a message before the encrypted message, saying that, if he cannot read it (because he does not have the pgp key), he can click on a link which would decrypt the message, if he knows the password.

Now my sieve configuration broke and I am unable to test until I fix it again. But I saw that enigma was behaving correctly. The message was displayed before the decryption password was entered, followed by the ---PGP PART---. Once the password was entered, the message of course disappeared. Same behavior in enigmail.

For my use, I would mark this as resolved. If there is some other use, I don't know.

On Wed, Jan 27, 2016 at 10:00 AM, Roundcube Webmail <trac@roundcube.net> wrote:

#1490633: Enigma: Mail containing text + PGP encrypted part is not decrypted
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Reporter: devotedmystic | Owner:
Type: Bugs | Status: new
Priority: 3 | Milestone: 1.2-RC
Component: Plugins | Version: 1.2-beta
Severity: major | Resolution:
Keywords: |
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Comment (by alec):

I couldn't find any standard for this, but e.g. Enigmail can handle such
messages (with warning that only part of the body was encrypted). So, we
should support this too, I suppose.
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Ticket URL: <http://trac.roundcube.net/ticket/1490633#comment:4>
Roundcube Webmail <http://www.roundcube.net/>
Roundcube Webmail is a browser-based multilingual IMAP client with an application-like user interface. It provides full functionality you expect from an e-mail client, including MIME support, address book, spell checking, folder manipulation and plugins. Roundcube Webmail is written in PHP and requires a MySQL, Postgres, MSSql or SQlite database. The user interface is fully skinnable using HTML and CSS.