smtp - How can I tell if I have an open relay? -

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i'm trying work out if have open relay on server. how do that?

i've tried http://www.abuse.net/relay.html

and reports:

hmmn, @ first glance, host appeared accept message relay. may or may not mean it's open relay. systems appear accept relay mail, reject messages internally rather delivering them, cannot tell @ point whether message relayed or not.

what further tests can determine if server has open relay?

eh? link tells you, register site , give address @abuse.net, valid 24 hours. enter address testing form. if abuse.net account receives test email, have open relay.


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