Re: [gentoo-user] Is my postfix being used as a relay?

["Kevin O'Gorman" <kogorman@gmail.com>]

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On 3/16/06, Iain Buchanan <iaindb@netspace.net.au> wrote:
>
> On Thu, 2006-03-16 at 14:52 -0500, JimD wrote:
> > On Thu, 16 Mar 2006 11:12:28 -0800
> > "Kevin O'Gorman" <kogorman@gmail.com> wrote:
> >
> > > I get a lot of bounce messages from Postfix relating to emails
> > > that are not actually from me, and the mail q shows lots of
> > > stuff I don't recognize.
> > >
> > > I'd like to know how to interpret this, and if it is called-for,
> > > to secure this daemon a bit more.
> >
> > Try this link:
> > http://www.spamhelp.org/shopenrelay/
> >
> > Just put in the IP and port and click the button.
>
> which automatically notifies a list of spammers that they can use your
> mail server... no not really ;)
>
> Do you have a firewall?  Should your box be accessible from outside?
> You could lock it down so _no_one_ outside can access it, or you could
> restrict it to certain ip's...
>
> But I also get a few bounce messages "from me" about emails I never
> wrote - once your email address is out there, spammers use it as their
> from address, even if they're not using your mail server for a relay.
>
> sucks.


Yes, I expose this machine's port 25 on purpose.  So I would like to make
it a good netizen.

I had done this with sendmail in previous distros, but am a neophyte with
Postfix.  Right now I want to verify if I have (or am) a problem.

++ kevin


--
Kevin O'Gorman, PhD

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