Polderbits sound recorder and editor

I get this when I try to contact Polderbits:
This report relates to a message you sent with the following header fields:

Message-id: <6F249994CEF54181ADD4694D19E6D177@KarlPC>
Date: Sat, 15 Nov 2014 21:26:20 -0500
From: "Karolus" <***@***>
To: <***@***>

Your message cannot be delivered to the following recipients:

Recipient address: ***@***
Reason: Illegal host/domain name found