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.