----- The following addresses had permanent fatal errors -----
<target email address>
(reason: 550-The sender 18.104.22.168 is in a black list at bl.spamcop.net)
The <target email address> is the person I sent an email to using mail.orcon.net.nz as my SMTP server. The IP address shown is an Orcon host according to ip-lookup.net.
Do Orcon have a black listing problem here?