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Fellow list folk:

Situation:  My company is very restrictive on internet and email use.  Only select 
users are allowed external use, and fewer still have unrestricted net access.  
Communications (email) with 'customer data' are not permitted outside the corporate 
perimter, including the DMZ.  We do not wish to have all of our users able to 
pop3/smtp outside our corporate perimeter, even to the DMZ.  We want an email schema 
as listed below:

Inside<->Inside:      all users
Inside<->Outside:     Only those designated by management

Currently external mail is hosted by our ISP but saving that money would be nice.

Thinking about a topology-based solution presents the following:

I can set up a 'corporate' mail server Inside (and no external linkage)without much 
trouble.  But then the external-permitted people have to manage two accounts, one for 
inside and one for external mail (since those having external mail are some of the 
least computer savvy, this is not the best answer).

Research indicates that putting a mail server Inside and then configuring a conduit 
through our firewall is the least preferable option, as compromise would allow Inside 
access.

We don't want to place the server in the DMZ because then we'd have to permit 
smtp/POP3 to all users outside, and this does not meet the 'no customer data Outside' 
criteria.

It seems I'm between a rock and a hard place.  Have I missed something?  Encryption 
may be an option, but is not implemented currently and we would still reqire a policy 
change (read slow Board proposal/approval process) before this would be a solution for 
a DMZ mail server.

Any suggestions as to a topology or other creative solution that would work would be 
greatly appreciated.

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