This is the best reply to our automated postmaster system. I bolded it to make it stand out :)
----- Original Message ----- From: "Mail Delivery System" <firstname.lastname@example.org>
Sent: Tuesday, September 12, 2006 5:10 PM
Subject: Undelivered Mail Returned to Sender
> This is the Postfix program at host xxxxxxxxx.com.
> I'm sorry to have to inform you that your message could not
> be delivered to one or more recipients. It's attached below.
> For further assistance, please send mail to
> If you do so, please include this problem report. You can
> delete your own text from the attached returned message.
> The Postfix program
> <email@example.com>: Host or domain name not found. Name service error for
> name=xxxxxxxxx.net type=A: Host not found