I use Windows 10 and I have installed a Debian 9 virtual machine with Bridge connection so that both are on the same network, I am configuring a mail server on the virtual machine and everything works fine if I connect from another computer that is not my main machine.
The fact is that there is no connection between my virtual machine and my host machine, with the rest of the computers in the network I do not have any problem, since I disable the Firewall on my host and I do not use antivirus, it does not occur to me that I can be happening.