i was recently setting up a ubuntu based system without using gnome, unity, kde, etc… and i needed to install the graphics drivers using ubuntu’s additional drivers program (called jockey) but via command line.
i found that it was easier than i thought since jockey comes with a text based version.
if you run your own mail server you know that spam filtering sucks. i’ve been using a method called greylisting for years and have had pretty good results with it.
greylisting will temporary block an unknown mail server from delivering a message to your server by sending a “try later” response. since most spam servers are presummed to not be setup correctly, it is thought that they will not try again. when a properly setup mailserver resends the message, it will then be delivered.