Open Mail Relay

Noel Jones noeldude at
Sat Aug 14 18:42:32 UTC 2010

On Sat, Aug 14, 2010 at 8:29 AM,  <peter at> wrote:
> I have a machine running FreeBSD, sendmail and majordomo.  I have someone who is on one of those majordomo lists complaining that they are receiving spam from me.  The complainer says I have an open mail relay that I need to fix.

Insufficient data.  The person reporting the spam needs to provide you
with a copy of the mail, including all headers, so you can see if it
came from your server, or who sent it through your server.

Most likely suspects are another list member's infected machine
sending out spam to the list, or an outright forgery that never went
through your server.

> I went to <> to test the machine using its IP address. gives a clean bill of health, saying relaying was denied in 17 separate tests.

Then it's unlikely your server is an open relay.  But you may need to
add some spam filtering to your lists, or at least restrict posting to
members only.

  -- Noel Jones

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