[Cialug] OT - maybe - out-going e-mail address blacklist ???

[Rob Miller]

Every once-in-a-while I have a curious idea that I'm not sure to which I
can find the answer.  I do know that someone on this list will know the
answer.

Is there a corporate e-mail system like Exchange or some other part of a
network like the firewall that has a feature that would block an out-going
e-mail message being sent to a specific address? I'm thinking this might be
described as an out-going blacklist or a reverse blacklist.  I'm thinking
that this might be of interest to info security managers and paranoid
corporate types so that employees would be blocked from sending corporate
secrets immediately and directly to an address within a competitor's
network or to a media outlet.  Maybe a government organization would want
to prevent an employee from sending messages to jassaunge at wikidrips.org or
using an anonymous remailing service like who remembers "anon.penet.fi" ???

An even cooler concept would be some type of routing code that could be
added to a message as it was leaving its home network that would prevent
anyone from forwarding the message to specific addresses.  I guess that
would solve the problem of a message being sent to an anonymous remailer.

TIA for any replies, discussion, etc.

Rob Miller