How to unblock port 25 on PC?

Question

Computer networks

I can not unblock port 25 in any way.
The port was blocked after the removal of Eset and Avast antiviruses.
Also stopped connecting to the VPN, writes the port is closed.
How to fix?

Answer 1

Completely disable the Firewall (for example, the windows firewall).
If it doesn't help, then it's not the PC.

Answer 2

Many mailers support an alternative port for sending and its providers block it much less often - 587. Try it as an option.