from name problem

[efagokan1]

Hello

We received an email like the one below. The from email address is spammer, but the from spelled the name part differently. That's why the email has passed. How can I prevent this?

Code: Select all

From: Zebe, Anna@yyy.com
<info@notebook-xxx.coxm>
Subject: RE: Purchase Order # : Thyssenkrupp PO161324 (Urgent!)
Content-Transfer-Encoding: 8Bbit
X-Priority: 1
X-MSMail-Priority: High
X-Mailer: Microsoft
Accept-Language: en-US
Content-Language: en-US

[daxis]

Block info@notebook-xxx.coxm
That's the emailaddress it's originating from.

Looks to me it's an invalid tld and therefor an invalid domain and emailaddress.
With proper postfix configuration it shouldn't have been accepted at all.