Subject: Undeliverable mail: По Вашему запросу высылаю информацию о семинаре.

From: <[email-masked]>
Date: Wed, 24 Sep 2008 16:21:42 +0400

Failed to deliver to [email-masked]'
SMTP module(domain [83.166.226.245]) reports:
 host 83.166.226.245 says:
 550 <[email-masked]>... User unknown