I am running W2K3/SMTP/POP3 for my home office and I am getting more and
more attempts to relay from my server.  Most of them are coming from:
china9988@21cn.com address.  The messages aren't being deliverered, so they
being bounced back to me.  How (or is there a way) to prevent it?

The message is sent to and from:   china9988@21cn.com  with this in the
body: t_Smtp.LocalIP.  Of course, it is bouncing back as NDR.

I have followed all the suggested "anti-relaying" techniques.  Am I just
"stuck" with some lame-a$$ trying to relay?

-Kevin

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Kevin Buchanan wrote:

> I am running W2K3/SMTP/POP3 for my home office and I am getting more and
> more attempts to relay from my server.  Most of them are coming from:
> china9988@21cn.com address.  The messages aren't being deliverered, so the
y
> being bounced back to me.  How (or is there a way) to prevent it?

Aren't You confusing two things?

Relaying means someone's trying to abuse your machine to send mails
elsewhere Disable that!

a sure way to test it is to telnet to your machine on port 25 (smtp
port) and doing smoething like:

"helo foobar.com"

mail from:<fake@nonexisting.company.com>

rcpt to:<fake@another.nonexisting.company.com>

data .

if you get to the data command, then your mailserver is open for
relaying and you're really into trouble.

What You#re most likely seeing though is that someone is spamming the
internet with your address as the envelop sender.

there is not much you can do about that...


--
Martin Bodenstedt

Landtag von Baden-Württemberg (www.landtag-bw.de)

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