Subject: Warning: could not send message for past 4 hours

From: Mail Delivery Subsystem <[email-masked]>
Date: Fri, 22 Aug 2008 08:23:09 +0400 (MSD)

**********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Fri, 22 Aug 2008 04:21:42 +0400 (MSD)
from dsl-200-67-91-25.prod-empresarial.com.mx [200.67.91.25]

   ----- Transcript of session follows -----
>>> DATA
<<< 450 4.2.0 /var/mail/virtuser_1007: Disc quota exceeded
\virtuser_1007... Deferred: 450 4.2.0 /var/mail/virtuser_1007: Disc quota exceeded
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old