**Adjusting UFW.** You should probably leave UFW in its super-protected stage! You don't want to use a Bitcoin machine for other services, because everyone increases your vulnerability! If you decide otherwise, there are several [guides to UFW](https://www.digitalocean.com/community/tutorials/ufw-essentials-common-firewall-rules-and-commands) that will allow you to add services. As advertised, it's ncomplicated. For example adding mail services would just require opening the mail port: `sudo ufw allow 25`. But don't do that.
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