Subject: Undeliverable mail: Внутренний аудит в системе менеджмента качества

From: [email-masked]
Date: Wed, 08 Oct 2008 12:55:19 +0400

Failed to deliver to '<[email-masked]>'
SMTP module(domain centre.real-estate.ru:25) reports:
 host centre.real-estate.ru:25 says:
 550 [email-masked] unknown user account