sending mail through vpn

Mail
1

I can send mail from all accounts from windows but when I turn on open vpn I can’t.
Any help would be appreciated.

2

I use NordVPN and sending works.

Try a Google search of “openvpn email won’t send” There is some information about OpenVPN, email, ports, etc.

If you can, try another VPN, even a free trial of a paid one to test.