My dad is trying to make a website for my little brother’s high school PTSA; Among the functions he needed to use was mail(). It’s pretty drop-dead simple, but I needed to figure out what I was doing for sendmail, first, since I’d never set it up before. A little bit of searching showed that sendmail on my system was provided by ssmtp, and I was able to edit it’s config file to set up the proper external host.