Subject: Undeliverable mail: Это тот учебный курс

From: <[email-masked]>
Date: Tue, 23 Sep 2008 09:38:56 +0400

Failed to deliver to [email-masked]'
SMTP module(domain [195.68.151.214]) reports:
 host 195.68.151.214 says:
 550 5.1.1 User unknown