Re: Relay attempts
From: Martin Bodenstedt (martin.bodenstedt_at_landtag-bw.de)
Date: 07/12/04
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Date: Mon, 12 Jul 2004 10:25:07 +0200
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 they
> 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)
- Next message: Igor: "Windows2003 Virtual SMTP and Exchange 2003 Timeout"
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