IMAP Proxy for Security

[G Farnham <gfarnham () gmail com>]

Does anyone have experience setting up an IMAP proxy for Security that
they can share?
The scenario is this:
You have a mail server (e.g. Exchange) on your internal.  Your users
have smart phones that they want to be able to connect to imap from an
IP.
You want to put a proxy in DMZ add some security and proxy IMAP over
TLS (port 993) to your mail server.
By "add some security" this could be things like check if protocol
meets RFC, connecting limiting, additional authentication, etc.
Most of the imap proxy info I have found is about deploying proxies
for performance or architectural reasons.  Looks like the proxies just
pass the connection through and don't add security.

The ones I've come across are:
Cyrus  http://www.cyrusimap.org/
ImapProxy  http://imapproxy.org/
Nginx  http://wiki.nginx.org/Main
Perdition  http://horms.net/projects/perdition/
Dovecot  http://www.dovecot.org/

All suggestions welcome.

G

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