Re: sendmail: open-relay

[Matthew Seaman]

Peter Ulrich Kruppa wrote:

Hi,

I am running my own small mail-server, i.e. I use my desktop pc for
sending and receiving my private mails.
That worked quite nicely the last years. From time to time I tested my
mail-server via abuse.net's mail-relay tester. - Never got any
positives.
Now suddenly I receive one:
        This is a test of third-party mail relay, generated via the
        Network Abuse Clearinghouse at http://www.abuse.net.

            Test performed by <ulr...@pukruppa.net> from 213.146.114.24

        email.
        Otherwise, the server is subject to abuse by vandals and
        spammers,
        and probable blacklisting by recipients of the unwanted
        third-party
        e-mail.
Of course I had some fun trying to read sendmail's documentation. But I
guess I need some help with this.

I am running FreeBSD -STABLE 8.0 amd64 .
I don't think I ever played around with sendmail's configuration. I just
use it as came out of the box.

Any ideas?

Target host = 213.146.114.24 pukruppa.net A well-configured mail server should NOT relay third-party

Plenty.  But it would help a great deal if you showed us your ${hostname}.mc.
The default sendmail config in FreeBSD isn't an open relay.  In fact,
it takes a bit of effort to make sendmail do open relay type stuff nowadays,
and there are big fat warnings in the docco (/usr/share/sendmail/cf/README)
about most of those.

        Cheers,

        Matthew

--
Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
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