From: Rich Matheisen [MVP] on
On Mon, 15 Mar 2010 10:35:01 +0100, "Tim Roelands" <no(a)>

>I receive repeatly this kind of messages;
>We use our own Exchange server to sent en receive email. What can be done to
>prevent receiving this fals messages?

[ snip ]

>Received: from ( [])
> by with SMTP id 3si157254pxi.28.2010.;
> Wed, 03 Mar 2010 17:33:35 -0800 (PST)
>Received-SPF: neutral ( is neither permitted nor
>denied by best guess record for domain of nelleke.smits(a)
>Authentication-Results:; spf=neutral (
> is neither permitted nor denied by best guess record for
>domain of nelleke.smits(a) smtp.mail=nelleke.smits(a)

Is this your domain? ----------+

You can start by publishing a SPF record for your domain in your DNS.

Once other servers begin to no longer accept e-mail using a spoofed
address the number of these incidents should decline (they'll never
Rich Matheisen
MCSE+I, Exchange MVP