@woofie - The problem you were seeing with the network was symptomatic of something we used to see with the Superhub 2, something we never got to the bottom of,and to be honest I was surprised to see you getting that message on a Hub 3, as I hadn't seen this popping up much.
Can you do me a favour. Can you at least check the following.
Find your public IP by typing IP into a Google search box when connected to the Hub 3
86.15.xxx.xxx is listed in the SBL, in the following records: SBLCSS 86.15.xxx.xxx is not listed in the PBL (in green) 86.15.xxx.xxx is listed in the XBL,(in red) because it appears in: CBL Lookup
The entry in red is the cause of your problem, but the entry in blue is also of some concern.
Finally I'm going to suggest to Virgin Media that they update Spamhaus' PBL - as all dynamic addresses such as those given out by Virgin Media and other providers SHOULD be listed there. @ModTeam could you look into this?
Virgin Media's SMTP servers will block authentication attempts from all IP addresses listed on the CSS. Because being on the CSS means that your IP address has been seen delivering spam mail DIRECTLY to a mail exchanger - most commonly one or more honeypots set up by anti spam agencies.
This is blacklisting is nothing to do with Virgin Media, it is done by third parties.
The CBL listing indicates that something on your home network has been seen acting as if it has been compromised. Being on both lists strongly suggests that your home network has been infected with malware.
You need to check ALL devices on your network for malware and viruses. I recommend malwarebytes free edition, I don't really have a preference on the anti virus front.
Once you've disinfected the devices then you can consider de-listing the entries. BUT both the CBL and CSS automatically delist after about 48 hours anyway. DO NOT DELIST YOUR IP UNTIL YOU ARE SURE YOU'VE CLEANED YOUR NETWORK.
Note: Changing the router may well appear to fix your problem in the short term. This is because having a new router will give you a new IP address. HOWEVER if your devices are infected the new IP will end up being listed and the same problem will occur again.
Only use Helpful answer if your problems been solved.