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- qptsmtpd-plugin-gpg -
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Author : Dominik Meyer <dmeyer@federationhq.de>
Initial Date: 2013-08-12
This plugin for the SMTP MTA qpsmtpd will encrypt every incoming eMail, which
is not already PGP encrypted, with the recipients pgp public key.
I got the idea for this project, while reading: https://grepular.com/Automatically_Encrypting_all_Incoming_Email
A lot of code is inspired from the above project.
The pgp encryption ensures, that the eMail body is stored encrypted in the backend storage, for
example an IMAP server. A lot of current eMail clients support pgp/gpg encrypted emails and ask
for the pgp passphrase, if you select an encrypted email.
Problems/Security Considerations:
- The eMails are encrypted while getting into the mailserver. The eMails can be read in plain
from the network line by your backend provider, if the connection is not SSL/TLS encrypted
- The eMail lies unencrypted for some time into the spool directory of qpstmpd. This can not be
secured. But to reduce recovery attempts by an attacker you can use an encrypted spool directory
or a RAM Disk. Perhaps an encfs encrypted spool directory only readable by the qpstmpd user, created
manually at every boot may help, if you are paranoid.