Returned mail: Data format error

The original message was received at Sat, 4 Jun 2011 15:29:56 +0700 from formilux.org [132.20.13.106]

• The following addresses had permanent fatal errors ----- <haproxy#formilux.org>
• Transcript of session follows ----- ... while talking to 222.119.224.42:
  >>> DATA
  <<< 400-aturner; %MAIL-E-OPENOUT, error opening !AS as output <<< 400-aturner; -SYSTEM-F-EXDISKQUOTA, disk quota exceeded <<< 400
  • application/octet-stream attachment: letter.zip