Yes - In an ironic twist eukhost.com itself is blocking mail from Harrier !
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A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:
billing@eukhost.com
SMTP error from remote mail server after RCPT TO:
:
host mail.eukhost.com [92.48.65.14]: 550-JunkMail rejected - harrier.eukhost.com [217.112.82.25] is in an RBL, see
550 Blocked - see http://www.spamcop.net/bl.shtml?217.112.82.25