Hi,
    
    I have one of our users who is unable to send an email to one of his
    clients. His messages get returned with this message:
    
    Final-Recipient: rfc822;
stevek@teraco.com
    Action: failed
    Status: 5.0.0
    Diagnostic-code smtp; Site 
teraco.com (12.12.240.139) said
    after data sent: 550 5.7.1 Please send this email to your IT
    personnel. 550-5.7.1 We are rejecting your email, because you were
    found on 
zen.spamhaus.org
    spam black list.
    
    His email takes the form of 
authorized_user@ehowe.com
    I checked 
spamhaus.org and the IP address of 
ehowe.com is not being
    blacklisted. What is in their blacklist is his personal IP of the
    machine that he is sending the email from. It says 74.136.165.243 is
    listed in the PBL, in the following records:
    
    
PBL1548045
    
    This is why I can send an email to his client from an 
ehowe.com
    email address and he can't.
    
    Shouldn't his client's 
mail server (
teraco.com) be checking that the
    message it is receiving is from our e
mail server given the address
    isHIDDEN@ef="http://ehowe.com">ehowe.com and then checking the IP for 
ehowe.com to make sure
    it's not blacklisted?
    
    He tried to remove his IP address, which is assigned from his
    service provider, from the blacklist but 
spamhaus.org gave him this
    reply: 
Removal of IP addresses within this range from
      the PBL is not allowed by the netblock owner's policy.
    
    Is there anything we can do here or is it all on his clients email
    server.