Returned mail: Data format error

The original message was received at Sat, 9 Apr 2011 12:00:08 -0500 from 137.4.76.163

• The following addresses had permanent fatal errors ----- <haproxy#formilux.org>
• Transcript of session follows ----- ... while talking to server formilux.org.:
  >>> MAIL FROM:"The Post Office" <MAILER-DAEMON#formilux.org>
  <<< 508 Refused
  • application/octet-stream attachment: readme.zip