Emails not getting through to recipient – Bouncing!

[Anonymous]

I'm having a bit of a problem.  Two separate emails I sent this week bounced back to me.  The coincidence is that both recipients have @supanet.com addresses, and both claim they have not encountered this difficulty before and are receiving mail.  The email addresses ARE accurate!

This message was created automatically by mail delivery software.

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:

  XXXX>XXXXXX@supanet.com
    SMTP error from remote mail server after initial connection:
    host inbound.mail.netline.net.uk [213.40.180.222]:
    550-Host 79.170.44.49 is listed at http://www.uceprotect.net as a spam source.
    550 See http://www.uceprotect.net/en/rblcheck.php for the reason why.

[Author]

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