Spamhaus SBL-XBL Combined Block List identified this IP address or domain as sending spam.
This could be because of a virus, bad software, or misconfigured mail server. Spamhaus SBL-XBL Combined Block List thinks spam senders should be stopped, but safe IPs and domains should be allowed.
You can learn more about Spamhaus SBL-XBL Combined Block List delisting by visiting their website: https://check.spamhaus.org/