Open Mail Relay

John Levine johnl at
Sun Aug 15 00:53:45 UTC 2010

>Is's test adequate to rule out an open mail relay problem?  

It's pretty thorough, and most MTAs have default configurations that
don't permit relay, so it's much less of a problem than it was when I
wrote the tester many years ago.  I don't try to check for weak SMTP
AUTH passwords, a hole that some spamware exploits, so if you do AUTH,
it's conceivable that could be it.

In your case, though, I would wait for the complainer to forward you a
message or two with headers so you can figure out where is spam is
coming from.

John Levine, postmaster at,, Trumansburg NY postmaster

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