On Mon, 2003-12-22 at 14:28, Adam Ellis wrote: > > What I > am wondering is this - would it be possible to redirect SMTP to my Linux > server, use iptables to check that the recipient matches a valid user > from a list I'd supply, and, if so, route the message to the Exchange > server? As others have mentioned, this is not an optimal choice. You *might* be able to hack things together using strings and tarpit, but it would be a kluge at best. A couple of other options: I use a combination of Sendmail, ClamAV, MimeDefang and Spamassassin to clean up all inbound e-mail before passing it off to my mail server. You can find a great tutorial on setting this up here: http://www.rudolphtire.com/mimedefang-howto/ If you would rather get something that gives you a support contract, You might want to check out the CanIT Appliance: http://www.canit.ca/products.php Its pretty much the same setup I mention above with a few extra bells and whistles to make it easier to use. Of course you also have to pay for it, but it does come with support. HTH, C