Could somebody please explain this message to me:
firstname.lastname@example.org on 3/20/2007 2:47 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
< dmzpostal.cckh.com #5.7.1 SMTP; 550 5.7.1 Sender ID (PRA) Not Permitted>
The company that we are trying to email (cookcommunications) tells us that the issue is on our side, we think it is on their side. The funny thing is that this does not happen all of the time..it is random but in blocks of time.
dmzpostal.cckh is our mailsender server running on Linux. Our Exchange Server is 2003 SP2.
I also tried to do this through DOS and recieved the following message:
Connected to ccm-mail.ccm.ccm-net.org.
Escape character is '^]'.
220 ccm-mail.ccm.ccm-net.org Microsoft ESMTP MAIL Service, Version: 6.0.3790.1830 ready at Thu, 22 Mar 2007 07:47:14 -0600
250 ccm-mail.ccm.ccm-net.org Hello [126.96.36.199]
mail from: <email@example.com>
250 2.1.0 firstname.lastname@example.org....Sender OK
rcpt to: <email@example.com>
550 5.7.1 Unable to relay for firstname.lastname@example.org
554 5.5.2 No valid recipients
221 2.0.0 ccm-mail.ccm.ccm-net.org Service closing transmission channel
Connection closed by foreign host.
Not quite sure what this means but it looks like their mail server is not accepting our emails and they are pointing the finger back at us...neither of us have Sender ID enabled
Can someone clear this up for me?
Thanks so much in advance