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WebJul 23, 2024 · sudo apt install certbot When asked for confirmation, type Y and press ENTER. As part of the initial server setup in the prerequisites, you installed ufw, the uncomplicated firewall. You’ll need to configure it to allow the HTTP port 80, so that domain verification can be completed. Run the following command to enable it: sudo ufw allow 80 WebMay 17, 2024 · sudo certbot certonly --standalone -d mail.example.com The command starts an interactive configuration script which will ask a couple of questions to set up the certificate correctly. Select Yes to use the default vhost file and specify the settings manually. Enter the email server’s domain name like mail.example.com. john rodion actor