Subject: Undelivered Mail Returned to Sender

From: [email-masked]
Date: Wed, 27 Aug 2008 10:54:51 +0600 (YEKST)

This is the SMS & E-Mail program.
I'm sorry to have to inform you that the message returned 
below could not be delivered to one or more destinations.

gai4: 550-Mailbox unknown. Either there is no mailbox
associated with this 550-name or you do not have authorization to see it.