On 10/25/2012 11:33 PM, A G wrote:
> Hi,
>
> I'm currently accessing Gmail through an email client (roundcube). I would 
> like
> my emails to be encrypted and would like to use Djigzo as a Gateway. This is 
> how
> it would be:
>
> Email Client -> Djigzo -> Gmail
>
> My current understanding is that I've to add "smtp.gmail.com" under "External
> relay host" under MTA config for Djigzo along with username and passwords for
> all users. What I don't know are the settings that need to be done at the 
> email
> client's end (smtp, pop/imap, port numbers) to be able to access and send 
> emails
> through Djigzo.

The DJIGZO gateway only supports the SMTP part. It does provide any POP3 
or IMAP functionality. Based on your description it seems you are using 
Roundcube as an email client for your email stored on Gmail. So in this 
case the DJIGZO gateway will only support outgoing email:

Roundcube -> DJIGZO -> Gmail -> Internet recipient(s)

Since the DJIGZO gateway does *not* provide POP3 or IMAP, decryption of 
incoming email cannot be directly handled by the DJIGZO gateway unless 
the email is sent by SMTP to the DJIGZO gateway. Support for decryption 
"on the fly" requires a POP3 or IMAP proxy that can decrypt email when 
it's downloaded.

I can think of three options.

1. Use Fetchmail to download email from Gmail to a local email box. New 
email will be downloaded from Gmail and then sent through the gateway 
for decryption and after decryption the email is sent to the internal 
email from which you can POP3 or IMAP. This is supported out of the box 
with the DJIGZO virtual appliance (you should enable Fetchmail support 
on the console). Downside of this approach is that the email on Gmail is 
more or less duplicated on your own local box

2. Do the decryption on Roundcube. Seems however that Roundcube does not 
yet support S/MIME in the client (it's a planned feature). Some other 
webmail clients (like for example Horde) support S/MIME in the client.

3. Use PDF encryption instead of S/MIME. With PDF encryption you can 
locally decrypt the file. Downside is that if all your email is PDF 
encrypted, opening an email is kind of a burden since you need to 
provide a password all the time.

Kind regards,

Martijn

-- 
DJIGZO email encryption
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