sendmail: open-relay
Matthew Seaman
m.seaman at infracaninophile.co.uk
Mon Jan 4 13:02:59 UTC 2010
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.
>
> Target host = 213.146.114.24 pukruppa.net
> Test performed by <ulrich at pukruppa.net> from 213.146.114.24
>
> A well-configured mail server should NOT relay third-party
> 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?
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
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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