Decided to give a shot at temporary disposable emails and in a few days I developed Roasted.email
Using Ruby on Rails entirely and a sweet Bootstrap theme for the UI, I developed this service just as an experiment. It's open-source so feel free to check it out in Github.
Initially I was looking into setting up my own mail server but was having a hard time dealing with postfix and exim and couldn't get any progress done as I'm very very not familiar with mail servers. For now I'm using Sendgrid Parse API to help me in that matter by delivering the emails to my web app via a webhook.
It's still a project in it's infancy and I plan on improving it and maybe bring new features in :)
For now you can see it live at