Open Relay Checker before Opening MTA

Alex Satrapa grail at
Sun Feb 10 10:19:36 EST 2002

On Sunday, February 10, 2002, at 09:27 , Ben Elliston wrote:

> 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, from's listed MX
> hosts.  I don't know which MTAs implement this, though--anyone?

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

> If all you're trying to do is stop reading spam (as opposed to not
> receiving it), then you should check out SpamAssassin.

Anyone who is a victim of Telstra wants to stop receiving spam.  By the 
time it's in our mailboxes, we've already paid for it.  If the ORBS 
lookup and OR test cost less than actually receiving the spam, I'd do 
that rather than use an after-the-event system such as SpamAssassin.


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