Open Relay Checker before Opening MTA

[Ben Elliston]

>>>>> "Alex" == Alex Satrapa <grail at goldweb.com.au> writes:

  >> I realise that Neil's idea would prevent his system from *accepting*
  >> mail from open relays.  Another approach I have heard about is to only
  >> accept mail for a domain (say, domain.com) from domain.com's listed MX
  >> hosts.  I don't know which MTAs implement this, though--anyone?

  Alex> The only catch I can see with this is that a listed MX may only be for 
  Alex> incoming mail, with outgoing mail sent by other machines.

Yes, it's not foolproof -- but if you did it, I bet you'd stop
receiving spam.  :-)

Ben