Here is the error message sent back to the email sender:
This is the Postfix program at host spunkymail-mx4.dreamhost.com.
I’m sorry to have to inform you that your message could not be
be delivered to one or more recipients. It’s attached below.
For further assistance, please send mail to
If you do so, please include this problem report. You can
delete your own text from the attached returned message.
The Postfix program
email@example.com (expanded from
firstname.lastname@example.org): host MC.CH1.UMMAIL.com[126.96.36.199]
said: 550 FROM address from sending host is invalid (in reply to MAIL FROM
Reporting-MTA: dns; spunkymail-mx4.dreamhost.com
X-Postfix-Sender: rfc822; 4d7d8b---Kevin.McLoughlin@ascglobal.com
Arrival-Date: Tue, 25 Jul 2006 13:47:21 -0700 (PDT)
Final-Recipient: rfc822; email@example.com
Original-Recipient: rfc822; firstname.lastname@example.org
Diagnostic-Code: X-Postfix; host MC.CH1.UMMAIL.com[188.8.131.52] said: 550
FROM address from sending host is invalid (in reply to MAIL FROM command)