I am using internet server provider www. namespro.ca server settings for my email account set up with Thunderbird mail and the email account will not set up properly. I currently have (1) domain name "realestateX.com with www. namespro.ca and I am attempting to set the email accounts using Thunderbird Mail on a desktop CPU. The email accounts will NOT set up with ThunderBird Mail with this domain name, ''''''realestatex.com.'''''' On the other hand, the same domain name email account were succcesfully set up on OUTLOOK using the same www. namespro.ca server settings with success, they work properly in and out Back to the Desktop CPU and my Thunderbird Mail program; I have another email account set in with another domain email account realestatex.net with a completely different internet server provider www. webnames.ca and that email works fine in and out and the set up without an issue Back to namespro.ca their server settings work fine with MS 365 OUTLOOK email set up on my DELL laptop. However the server setting from namespro.ca will not work on the desktop and laptop, The laptop set up is using a MOZILLA Thunderbird Account Hub and stated their is an "'''authentication error because of a policy violation relating to the refused connection from the IP" .''' Would namepro.ca IP connection refusing my thunderbird mail account to syne with namespro.ca? any insight would be helpful, appreciate your time