[olug] Mail Relaying w/Filtering

[Eric Penne]

I have project coming up in the next couple weeks for work that I don't
have a lot of knowledge about.  We will be using Linux, so the good
news is that I will be able to read/learn about it.  

We have base stations out in the field that collect data from our
system.  These base stations (linux based 386) have ethernet, serial,
and modem connections.  The serial reads data from another module.  The
ethernet and modem are used for communications with us.  The modem can
dial into our service provider and email the data it has.  The service
provider won't let us do the same thing through ethernet because it
does not orginate from inside thier system (ie not from their modem
pool).  We wnat to set up a mail relay system that we can use for all
email communication (modem and ethernet).  Of course we don't want it
to be open to the rest of the world.  Here is my question:  Can we set
up a relay that can filter the mail so that it must conform to a
specific format or have a specific identifier in it?

Ideally we wouldn't have to base it on MAC address or anything so that
we don't have to update the mail server everytime we send out new
units.  We also might have other issues with the buyers firewalls but
that will be addressed later.

Later
Eric


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