I’m a service provider and we have our mail gateway which serve our clients, and recently we can see in our side that we get this message:
host cluster1.us.messagelabs.com[220.127.116.11] refused to talk to me: 501 Connection rejected by policy. Please visit www.messagelabs.com/support for more details.
Which is the best way to get our IP address whitelisted? we already check with different tools, if we belong to any public/private blacklist, but we are not.
Maybe someone from Symantec team could have a look at our IP address, 18.104.22.168 and check what could be happening.
Thanks in advance,