Email header:
Could not deliver message to the following recipient(s):
Failed Recipient: XXX@bigpond.com
Reason: Remote host said: 554 Connection refused. 63.134.207.41 is blacklisted. Contact Telstra Security Operations IB102
This happens every time we send an email to a bigpond address.
The host server IP address is listed against Backscatterer and Sorbs (https://mxtoolbox.com/SuperTool.aspx?action=blacklist%3a63.134.207.41&run=toolpage). These are not valid blacklists. A blacklist would give you a web address to view the blacklist, wouldn't it?
There doesn't appear to be enough information in the bounce back email. Telstra uses Sorbs but... https://smartertrack.webcontrolcenter.com/kb/a919/the-dnsbl_sorbs_net-spam-filter.aspx?KBSearchID=491945.
Need help FAST! as we send weekly Friday bulletins to our members and other bulk emails - 90 of which have bigpond email addresses.