Set Outgoing Message Expiration

I am using squirrelmail in conjunction with our Ironport simply as a
send-mail portal for users to send encrypted messages.  Most everything has
been stripped and when users login, they are simply presented with the
compose message page.  I believe we can flag a message with an x-header to
set an expiration for the decryption of the message within Cisco's services. 
I read something about a message expiration plugin but couldn't find that
plugin.  Has anyone had experience with anything related to setting message
expiration on outbound messages?

I would like to set a default, but potentially allow users to override that
(maybe within a certain range and a selection from a calendar pop-up would
be fantastic).

Thanks in advance,
Stephen Zemlicka



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