Open Mail Relay

Mikhail hidden.node at
Sat Aug 14 18:05:55 UTC 2010

On 14.08.2010 17:29, peter at wrote:
> I've reviewed my mail logs for the past couple of days and I can't
> find any entries for any mail addressed to the complainer's domain
> name except mail that should have been sent.

You can try it yourself, with telnet and proper smtp commands. For 
example, telnet from outside of your organization to your mail server 
and issue:

mail from: foobar at
rcpt to: foobar at
test mail

You actually have to get error message about relay denied for you. If 
you don't - you're in trouble.
If you do recieve such message - you relay is closed and probably you 
have spam worms who send emails from legit user, or something like that.

Be well.

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