Encrypting Email

[Julian Field]

At 18:27 12/05/2003, you wrote:
>Has anyone implemented a system to encrypt emails using GPG or something
>similar
>at the MTA?
>
>I don't think thats half as easy as it sounds.  The biggest problem
>would be getting the public keys for all recipients (although there are
>the key servers...).

Check SweepContent.pm line 161 and you will find a commented-out couple of
lines of code which are designed to reap public keys from messages passing
through MailScanner.

>   Its also likely to be computationally expensive if
>you want to do it for all mail (assuming all your recipients have a gpg
>key - which is frankly unlikely).  Not to mention the bandwidth cost of
>having to send separately encrypted mails to each recipient (assuming my
>understanding is correct on that one).
>
>Digital signatures might be a more realistic prospect, but there are
>very good reasons why this should not be done at the MTA.
>
>Did you have a particular reason for wanting this?

--
Julian Field
www.MailScanner.info
Professional Support Services at www.MailScanner.biz
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