ORBS (Re: Scanning)

Owen DeLong owen at dixon.delong.sj.ca.us
Mon May 28 01:58:24 UTC 2001

> > I don't buy the "we need open relay for nationwide users" argument,
> > either.  Build a cheap MX that does nothing but take mail from a given
> > POP, and send it to the world.  Anti-spoofing at the border, 
> > don't accept mail from the outside world, and you're done.
> You must not have a roaming staff or are willing to keep telcos wealthy.
Roaming staff usually needs some form of VPN access, anyway, and even if
they don't, this is a great use for one.  Put a VPN client on the roamer's
computer (Linux, Mac, and Windows 9x/NT/ME/2k all have IPSEC capable clients
available), then use the VPN to get back to the mail relay.  If the mail
relay is behind the VPN tunnel termination point at the server end, then
it should only accept mail for relay from valid VPN clients.  As such,
you solve the roaming staff problem without an open relay.  VPN boxes
like Ravlin and Nokia Crypto Cluster are cheap enough today that I would
consider it a valid cost of doing business if you don't have a better


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